| 
                 
                    Closing price on 9/11/2018
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    55.00 | 
                 
                
                    | High | 
                    57.00 | 
                 
                
                    | Low | 
                    55.00 | 
                     
                
                    | Volume | 
                    41,930 | 
                                 
                
                    | Split-adjusted Price | 
                    30.28 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PTB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/11/2018
             | 
            
                +1.70 / +3.09%
             |             
            
                55.00
             |           
            
                57.00
             |               
            
                55.00
             |                           
            
                56.70
             | 
            
                56.17
             |                     
            
                30.28
             |                                 
            
                41,930
             |            
            
                 
             |                                       
         
    
        
            | 
                9/10/2018
             | 
            
                -2.70 / -4.68%
             |             
            
                57.70
             |           
            
                57.70
             |               
            
                55.00
             |                           
            
                55.00
             | 
            
                55.47
             |                     
            
                29.37
             |                                 
            
                33,890
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/7/2018
             | 
            
                -0.20 / -0.35%
             |             
            
                56.40
             |           
            
                57.80
             |               
            
                56.40
             |                           
            
                57.70
             | 
            
                56.88
             |                     
            
                30.81
             |                                 
            
                13,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/6/2018
             | 
            
                -0.40 / -0.69%
             |             
            
                59.50
             |           
            
                59.50
             |               
            
                55.60
             |                           
            
                57.90
             | 
            
                57.02
             |                     
            
                30.92
             |                                 
            
                49,580
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/5/2018
             | 
            
                +0.30 / +0.52%
             |             
            
                58.00
             |           
            
                59.80
             |               
            
                57.60
             |                           
            
                58.30
             | 
            
                58.82
             |                     
            
                31.13
             |                                 
            
                25,010
             |            
            
                 
             |                                       
         
    
        
            | 
                9/4/2018
             | 
            
                -1.60 / -2.68%
             |             
            
                59.40
             |           
            
                59.40
             |               
            
                58.00
             |                           
            
                58.00
             | 
            
                58.74
             |                     
            
                30.97
             |                                 
            
                58,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/31/2018
             | 
            
                -0.90 / -1.49%
             |             
            
                60.50
             |           
            
                61.00
             |               
            
                59.40
             |                           
            
                59.60
             | 
            
                59.97
             |                     
            
                31.83
             |                                 
            
                26,980
             |            
            
                 
             |                                       
         
    
        
            | 
                8/30/2018
             | 
            
                -0.40 / -0.66%
             |             
            
                59.90
             |           
            
                60.80
             |               
            
                59.90
             |                           
            
                60.50
             | 
            
                60.37
             |                     
            
                32.31
             |                                 
            
                14,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/29/2018
             | 
            
                -0.10 / -0.16%
             |             
            
                61.00
             |           
            
                61.40
             |               
            
                60.50
             |                           
            
                60.90
             | 
            
                60.75
             |                     
            
                32.52
             |                                 
            
                45,320
             |            
            
                 
             |                                       
         
    
        
            | 
                8/28/2018
             | 
            
                +0.50 / +0.83%
             |             
            
                60.50
             |           
            
                61.40
             |               
            
                60.50
             |                           
            
                61.00
             | 
            
                60.97
             |                     
            
                32.57
             |                                 
            
                64,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/27/2018
             | 
            
                -0.40 / -0.66%
             |             
            
                60.20
             |           
            
                61.50
             |               
            
                60.10
             |                           
            
                60.50
             | 
            
                60.60
             |                     
            
                32.31
             |                                 
            
                22,820
             |            
            
                 
             |                                       
         
    
        
            | 
                8/24/2018
             | 
            
                +1.00 / +1.67%
             |             
            
                60.20
             |           
            
                61.30
             |               
            
                59.00
             |                           
            
                60.90
             | 
            
                60.34
             |                     
            
                32.52
             |                                 
            
                121,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/23/2018
             | 
            
                -0.10 / -0.17%
             |             
            
                58.70
             |           
            
                61.00
             |               
            
                58.70
             |                           
            
                59.90
             | 
            
                60.57
             |                     
            
                31.99
             |                                 
            
                78,920
             |            
            
                 
             |                                       
         
    
        
            | 
                8/22/2018
             | 
            
                +2.20 / +3.81%
             |             
            
                57.80
             |           
            
                61.00
             |               
            
                57.80
             |                           
            
                60.00
             | 
            
                59.40
             |                     
            
                32.04
             |                                 
            
                101,020
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/21/2018
             | 
            
                +0.30 / +0.52%
             |             
            
                57.50
             |           
            
                57.90
             |               
            
                57.50
             |                           
            
                57.80
             | 
            
                57.60
             |                     
            
                30.87
             |                                 
            
                30,210
             |            
            
                 
             |                                       
         
    
        
            | 
                8/20/2018
             | 
            
                0.00 / 0.00%
             |             
            
                57.30
             |           
            
                58.40
             |               
            
                57.30
             |                           
            
                57.50
             | 
            
                57.57
             |                     
            
                30.71
             |                                 
            
                58,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/17/2018
             | 
            
                -0.50 / -0.86%
             |             
            
                57.50
             |           
            
                58.10
             |               
            
                57.10
             |                           
            
                57.50
             | 
            
                57.44
             |                     
            
                30.71
             |                                 
            
                57,960
             |            
            
                 
             |                                       
         
    
        
            | 
                8/16/2018
             | 
            
                +1.00 / +1.75%
             |             
            
                57.00
             |           
            
                58.40
             |               
            
                57.00
             |                           
            
                58.00
             | 
            
                57.50
             |                     
            
                30.97
             |                                 
            
                70,380
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/15/2018
             | 
            
                -0.50 / -0.87%
             |             
            
                57.50
             |           
            
                58.30
             |               
            
                57.00
             |                           
            
                57.00
             | 
            
                57.09
             |                     
            
                30.44
             |                                 
            
                53,830
             |            
            
                 
             |                                       
         
    
        
            | 
                8/14/2018
             | 
            
                +0.70 / +1.23%
             |             
            
                56.50
             |           
            
                57.50
             |               
            
                55.80
             |                           
            
                57.50
             | 
            
                56.56
             |                     
            
                30.71
             |                                 
            
                71,070
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/13/2018
             | 
            
                -0.70 / -1.22%
             |             
            
                57.50
             |           
            
                57.50
             |               
            
                56.00
             |                           
            
                56.80
             | 
            
                56.70
             |                     
            
                30.33
             |                                 
            
                50,350
             |            
            
                 
             |                                       
         
    
        
            | 
                8/10/2018
             | 
            
                -1.50 / -2.54%
             |             
            
                59.00
             |           
            
                59.00
             |               
            
                56.60
             |                           
            
                57.50
             | 
            
                57.25
             |                     
            
                30.71
             |                                 
            
                56,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/9/2018
             | 
            
                +1.50 / +2.61%
             |             
            
                58.00
             |           
            
                61.00
             |               
            
                58.00
             |                           
            
                59.00
             | 
            
                59.31
             |                     
            
                31.51
             |                                 
            
                49,470
             |            
            
                 
             |                                       
         
    
        
            | 
                8/8/2018
             | 
            
                +1.20 / +2.13%
             |             
            
                56.00
             |           
            
                57.90
             |               
            
                55.70
             |                           
            
                57.50
             | 
            
                57.18
             |                     
            
                30.71
             |                                 
            
                77,550
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/7/2018
             | 
            
                +0.80 / +1.44%
             |             
            
                55.50
             |           
            
                56.60
             |               
            
                54.00
             |                           
            
                56.30
             | 
            
                55.44
             |                     
            
                30.06
             |                                 
            
                127,710
             |            
            
                 
             |                                       
         
    
        
            | 
                8/6/2018
             | 
            
                -1.80 / -3.14%
             |             
            
                56.00
             |           
            
                57.40
             |               
            
                55.50
             |                           
            
                55.50
             | 
            
                56.17
             |                     
            
                29.64
             |                                 
            
                46,470
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/3/2018
             | 
            
                -1.70 / -2.88%
             |             
            
                59.00
             |           
            
                59.00
             |               
            
                57.00
             |                           
            
                57.30
             | 
            
                57.66
             |                     
            
                30.60
             |                                 
            
                35,970
             |            
            
                 
             |                                       
         
    
        
            | 
                8/2/2018
             | 
            
                0.00 / 0.00%
             |             
            
                58.60
             |           
            
                60.00
             |               
            
                58.60
             |                           
            
                59.00
             | 
            
                58.96
             |                     
            
                31.51
             |                                 
            
                20,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/1/2018
             | 
            
                -1.60 / -2.64%
             |             
            
                60.60
             |           
            
                62.00
             |               
            
                58.80
             |                           
            
                59.00
             | 
            
                59.87
             |                     
            
                31.51
             |                                 
            
                26,390
             |            
            
                 
             |                                       
         
    
        
            | 
                7/31/2018
             | 
            
                -1.40 / -2.26%
             |             
            
                63.00
             |           
            
                63.00
             |               
            
                58.60
             |                           
            
                60.60
             | 
            
                61.00
             |                     
            
                32.36
             |                                 
            
                33,490
             |  
            
                 
             |                                                              
             
    
         
    
    
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