| 
                 
                    Closing price on 9/5/2017
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    66.00 | 
                 
                
                    | High | 
                    66.00 | 
                 
                
                    | Low | 
                    65.00 | 
                     
                
                    | Volume | 
                    57,500 | 
                                 
                
                    | Split-adjusted Price | 
                    24.96 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NTC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/5/2017
             | 
            
                -0.60 / -0.91%
             |             
            
                66.00
             |           
            
                66.00
             |               
            
                65.00
             |                           
            
                65.10
             | 
            
                65.47
             |                     
            
                24.96
             |                                 
            
                57,500
             |            
            
                 
             |                                       
         
    
        
            | 
                9/1/2017
             | 
            
                -0.20 / -0.30%
             |             
            
                65.60
             |           
            
                66.20
             |               
            
                56.00
             |                           
            
                65.90
             | 
            
                65.71
             |                     
            
                25.26
             |                                 
            
                61,005
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/31/2017
             | 
            
                +1.60 / +2.48%
             |             
            
                64.20
             |           
            
                66.20
             |               
            
                64.20
             |                           
            
                66.10
             | 
            
                65.64
             |                     
            
                25.34
             |                                 
            
                69,300
             |            
            
                 
             |                                       
         
    
        
            | 
                8/30/2017
             | 
            
                +2.00 / +3.20%
             |             
            
                63.00
             |           
            
                64.90
             |               
            
                62.30
             |                           
            
                64.50
             | 
            
                64.10
             |                     
            
                24.73
             |                                 
            
                93,415
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/29/2017
             | 
            
                -0.40 / -0.64%
             |             
            
                61.20
             |           
            
                64.00
             |               
            
                61.20
             |                           
            
                62.50
             | 
            
                62.34
             |                     
            
                23.96
             |                                 
            
                41,900
             |            
            
                 
             |                                       
         
    
        
            | 
                8/28/2017
             | 
            
                -0.60 / -0.94%
             |             
            
                61.10
             |           
            
                63.50
             |               
            
                61.10
             |                           
            
                62.90
             | 
            
                62.09
             |                     
            
                24.11
             |                                 
            
                77,930
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/25/2017
             | 
            
                -0.50 / -0.78%
             |             
            
                63.60
             |           
            
                64.10
             |               
            
                63.30
             |                           
            
                63.40
             | 
            
                63.52
             |                     
            
                24.31
             |                                 
            
                34,200
             |            
            
                 
             |                                       
         
    
        
            | 
                8/24/2017
             | 
            
                0.00 / 0.00%
             |             
            
                63.80
             |           
            
                64.50
             |               
            
                63.70
             |                           
            
                63.90
             | 
            
                64.01
             |                     
            
                24.50
             |                                 
            
                44,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/23/2017
             | 
            
                +0.50 / +0.79%
             |             
            
                63.40
             |           
            
                64.00
             |               
            
                63.30
             |                           
            
                63.90
             | 
            
                63.72
             |                     
            
                24.50
             |                                 
            
                28,430
             |            
            
                 
             |                                       
         
    
        
            | 
                8/22/2017
             | 
            
                +1.10 / +1.77%
             |             
            
                62.10
             |           
            
                65.50
             |               
            
                62.00
             |                           
            
                63.40
             | 
            
                63.96
             |                     
            
                24.31
             |                                 
            
                110,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/21/2017
             | 
            
                +0.50 / +0.81%
             |             
            
                61.10
             |           
            
                64.00
             |               
            
                61.10
             |                           
            
                62.30
             | 
            
                62.56
             |                     
            
                23.88
             |                                 
            
                70,635
             |            
            
                 
             |                                       
         
    
        
            | 
                8/18/2017
             | 
            
                +0.60 / +0.97%
             |             
            
                62.30
             |           
            
                62.50
             |               
            
                61.00
             |                           
            
                62.40
             | 
            
                61.76
             |                     
            
                23.92
             |                                 
            
                29,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/17/2017
             | 
            
                +1.30 / +2.15%
             |             
            
                60.50
             |           
            
                63.60
             |               
            
                60.50
             |                           
            
                61.80
             | 
            
                62.33
             |                     
            
                23.69
             |                                 
            
                100,025
             |            
            
                 
             |                                       
         
    
        
            | 
                8/16/2017
             | 
            
                0.00 / 0.00%
             |             
            
                60.50
             |           
            
                60.50
             |               
            
                60.00
             |                           
            
                60.50
             | 
            
                60.24
             |                     
            
                23.19
             |                                 
            
                37,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/15/2017
             | 
            
                +0.90 / +1.51%
             |             
            
                59.40
             |           
            
                61.60
             |               
            
                59.40
             |                           
            
                60.50
             | 
            
                60.48
             |                     
            
                23.19
             |                                 
            
                77,198
             |            
            
                 
             |                                       
         
    
        
            | 
                8/14/2017
             | 
            
                +0.20 / +0.34%
             |             
            
                60.00
             |           
            
                60.00
             |               
            
                59.00
             |                           
            
                59.60
             | 
            
                59.35
             |                     
            
                22.85
             |                                 
            
                30,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/11/2017
             | 
            
                +0.10 / +0.17%
             |             
            
                59.40
             |           
            
                59.60
             |               
            
                59.00
             |                           
            
                59.60
             | 
            
                59.42
             |                     
            
                22.85
             |                                 
            
                13,100
             |            
            
                 
             |                                       
         
    
        
            | 
                8/10/2017
             | 
            
                -0.30 / -0.50%
             |             
            
                58.80
             |           
            
                59.50
             |               
            
                58.80
             |                           
            
                59.50
             | 
            
                59.35
             |                     
            
                22.81
             |                                 
            
                18,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/9/2017
             | 
            
                -0.60 / -0.99%
             |             
            
                60.00
             |           
            
                60.20
             |               
            
                59.30
             |                           
            
                59.80
             | 
            
                59.74
             |                     
            
                22.93
             |                                 
            
                13,200
             |            
            
                 
             |                                       
         
    
        
            | 
                8/8/2017
             | 
            
                -0.20 / -0.33%
             |             
            
                62.00
             |           
            
                62.00
             |               
            
                59.90
             |                           
            
                60.40
             | 
            
                60.26
             |                     
            
                23.16
             |                                 
            
                36,430
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/7/2017
             | 
            
                +1.20 / +2.02%
             |             
            
                60.30
             |           
            
                60.60
             |               
            
                59.70
             |                           
            
                60.60
             | 
            
                60.29
             |                     
            
                23.23
             |                                 
            
                37,600
             |            
            
                 
             |                                       
         
    
        
            | 
                8/4/2017
             | 
            
                +1.60 / +2.74%
             |             
            
                58.00
             |           
            
                60.50
             |               
            
                55.10
             |                           
            
                60.10
             | 
            
                59.37
             |                     
            
                23.04
             |                                 
            
                18,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/3/2017
             | 
            
                -1.50 / -2.50%
             |             
            
                60.50
             |           
            
                60.50
             |               
            
                58.50
             |                           
            
                58.50
             | 
            
                58.86
             |                     
            
                22.43
             |                                 
            
                51,530
             |            
            
                 
             |                                       
         
    
        
            | 
                8/2/2017
             | 
            
                +1.70 / +2.92%
             |             
            
                58.30
             |           
            
                60.00
             |               
            
                58.30
             |                           
            
                60.00
             | 
            
                59.40
             |                     
            
                23.00
             |                                 
            
                11,512
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/1/2017
             | 
            
                -1.60 / -2.67%
             |             
            
                60.00
             |           
            
                60.00
             |               
            
                58.00
             |                           
            
                58.30
             | 
            
                58.52
             |                     
            
                22.35
             |                                 
            
                128,000
             |            
            
                 
             |                                       
         
    
        
            | 
                7/31/2017
             | 
            
                -0.90 / -1.48%
             |             
            
                61.20
             |           
            
                61.50
             |               
            
                59.80
             |                           
            
                59.90
             | 
            
                60.09
             |                     
            
                22.96
             |                                 
            
                38,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/28/2017
             | 
            
                -0.90 / -1.46%
             |             
            
                60.80
             |           
            
                61.50
             |               
            
                60.00
             |                           
            
                60.60
             | 
            
                60.76
             |                     
            
                23.23
             |                                 
            
                27,200
             |            
            
                 
             |                                       
         
    
        
            | 
                7/27/2017
             | 
            
                -0.20 / -0.32%
             |             
            
                62.00
             |           
            
                62.20
             |               
            
                60.80
             |                           
            
                61.50
             | 
            
                61.45
             |                     
            
                23.58
             |                                 
            
                75,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/26/2017
             | 
            
                +0.20 / +0.33%
             |             
            
                61.10
             |           
            
                63.40
             |               
            
                61.00
             |                           
            
                61.70
             | 
            
                61.63
             |                     
            
                23.65
             |                                 
            
                59,920
             |            
            
                 
             |                                       
         
    
        
            | 
                7/25/2017
             | 
            
                +2.10 / +3.54%
             |             
            
                59.50
             |           
            
                62.00
             |               
            
                59.50
             |                           
            
                61.50
             | 
            
                60.97
             |                     
            
                23.58
             |                                 
            
                70,750
             |  
            
                 
             |                                                              
             
    
         
    
    
 |