| 
                 
                    Closing price on 12/20/2017
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    90.50 | 
                 
                
                    | High | 
                    91.00 | 
                 
                
                    | Low | 
                    89.40 | 
                     
                
                    | Volume | 
                    55,930 | 
                                 
                
                    | Split-adjusted Price | 
                    34.54 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NTC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                12/20/2017
             | 
            
                +0.10 / +0.11%
             |             
            
                90.50
             |           
            
                91.00
             |               
            
                89.40
             |                           
            
                90.10
             | 
            
                90.15
             |                     
            
                34.54
             |                                 
            
                55,930
             |            
            
                 
             |                                       
         
    
        
            | 
                12/19/2017
             | 
            
                -0.60 / -0.66%
             |             
            
                90.60
             |           
            
                90.60
             |               
            
                89.00
             |                           
            
                90.00
             | 
            
                89.50
             |                     
            
                34.50
             |                                 
            
                123,269
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/18/2017
             | 
            
                +3.20 / +3.66%
             |             
            
                89.00
             |           
            
                90.60
             |               
            
                89.00
             |                           
            
                90.60
             | 
            
                90.05
             |                     
            
                34.73
             |                                 
            
                72,060
             |            
            
                 
             |                                       
         
    
        
            | 
                12/15/2017
             | 
            
                +3.00 / +3.53%
             |             
            
                86.00
             |           
            
                88.80
             |               
            
                86.00
             |                           
            
                88.00
             | 
            
                87.42
             |                     
            
                33.74
             |                                 
            
                59,601
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/14/2017
             | 
            
                +2.50 / +3.03%
             |             
            
                82.90
             |           
            
                86.00
             |               
            
                82.60
             |                           
            
                85.00
             | 
            
                84.54
             |                     
            
                32.59
             |                                 
            
                207,905
             |            
            
                 
             |                                       
         
    
        
            | 
                12/13/2017
             | 
            
                +1.70 / +2.10%
             |             
            
                80.40
             |           
            
                83.70
             |               
            
                80.40
             |                           
            
                82.50
             | 
            
                82.47
             |                     
            
                31.63
             |                                 
            
                59,610
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/12/2017
             | 
            
                +1.30 / +1.64%
             |             
            
                80.10
             |           
            
                81.00
             |               
            
                79.50
             |                           
            
                80.80
             | 
            
                79.80
             |                     
            
                30.98
             |                                 
            
                51,300
             |            
            
                 
             |                                       
         
    
        
            | 
                12/11/2017
             | 
            
                -2.80 / -3.40%
             |             
            
                82.10
             |           
            
                82.10
             |               
            
                79.50
             |                           
            
                79.50
             | 
            
                80.58
             |                     
            
                30.48
             |                                 
            
                50,630
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/8/2017
             | 
            
                -0.50 / -0.61%
             |             
            
                82.00
             |           
            
                82.50
             |               
            
                82.00
             |                           
            
                82.00
             | 
            
                82.30
             |                     
            
                31.44
             |                                 
            
                41,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/7/2017
             | 
            
                +1.50 / +1.85%
             |             
            
                80.00
             |           
            
                83.00
             |               
            
                80.00
             |                           
            
                82.50
             | 
            
                82.20
             |                     
            
                31.63
             |                                 
            
                70,810
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/6/2017
             | 
            
                +1.00 / +1.25%
             |             
            
                80.00
             |           
            
                81.00
             |               
            
                78.90
             |                           
            
                81.00
             | 
            
                79.98
             |                     
            
                31.05
             |                                 
            
                65,220
             |            
            
                 
             |                                       
         
    
        
            | 
                12/5/2017
             | 
            
                -1.20 / -1.48%
             |             
            
                82.00
             |           
            
                82.10
             |               
            
                78.60
             |                           
            
                80.00
             | 
            
                80.72
             |                     
            
                30.67
             |                                 
            
                83,860
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/4/2017
             | 
            
                0.00 / 0.00%
             |             
            
                83.00
             |           
            
                83.00
             |               
            
                81.20
             |                           
            
                81.20
             | 
            
                81.75
             |                     
            
                31.13
             |                                 
            
                64,160
             |            
            
                 
             |                                       
         
    
        
            | 
                12/1/2017
             | 
            
                +2.00 / +2.50%
             |             
            
                80.50
             |           
            
                82.20
             |               
            
                79.00
             |                           
            
                82.00
             | 
            
                81.17
             |                     
            
                31.44
             |                                 
            
                133,380
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/30/2017
             | 
            
                +0.10 / +0.13%
             |             
            
                80.40
             |           
            
                80.40
             |               
            
                79.00
             |                           
            
                80.00
             | 
            
                79.87
             |                     
            
                30.67
             |                                 
            
                35,600
             |            
            
                 
             |                                       
         
    
        
            | 
                11/29/2017
             | 
            
                +3.90 / +5.13%
             |             
            
                76.30
             |           
            
                81.00
             |               
            
                75.60
             |                           
            
                79.90
             | 
            
                78.40
             |                     
            
                30.63
             |                                 
            
                117,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/28/2017
             | 
            
                +0.90 / +1.20%
             |             
            
                75.30
             |           
            
                76.40
             |               
            
                74.50
             |                           
            
                76.00
             | 
            
                75.42
             |                     
            
                29.14
             |                                 
            
                43,430
             |            
            
                 
             |                                       
         
    
        
            | 
                11/27/2017
             | 
            
                -0.50 / -0.66%
             |             
            
                76.00
             |           
            
                76.30
             |               
            
                74.90
             |                           
            
                75.10
             | 
            
                75.28
             |                     
            
                28.79
             |                                 
            
                18,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/24/2017
             | 
            
                +0.50 / +0.66%
             |             
            
                75.00
             |           
            
                76.60
             |               
            
                75.00
             |                           
            
                76.50
             | 
            
                75.61
             |                     
            
                29.33
             |                                 
            
                30,020
             |            
            
                 
             |                                       
         
    
        
            | 
                11/23/2017
             | 
            
                +2.50 / +3.40%
             |             
            
                73.80
             |           
            
                76.40
             |               
            
                73.50
             |                           
            
                76.00
             | 
            
                75.00
             |                     
            
                29.14
             |                                 
            
                92,868
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/22/2017
             | 
            
                +2.70 / +3.81%
             |             
            
                70.50
             |           
            
                73.50
             |               
            
                70.50
             |                           
            
                73.50
             | 
            
                72.10
             |                     
            
                28.18
             |                                 
            
                91,910
             |            
            
                 
             |                                       
         
    
        
            | 
                11/21/2017
             | 
            
                +0.40 / +0.57%
             |             
            
                70.30
             |           
            
                70.80
             |               
            
                70.10
             |                           
            
                70.80
             | 
            
                70.42
             |                     
            
                27.14
             |                                 
            
                34,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/20/2017
             | 
            
                +0.40 / +0.57%
             |             
            
                70.00
             |           
            
                70.50
             |               
            
                70.00
             |                           
            
                70.40
             | 
            
                70.28
             |                     
            
                26.99
             |                                 
            
                12,000
             |            
            
                 
             |                                       
         
    
        
            | 
                11/17/2017
             | 
            
                +0.40 / +0.57%
             |             
            
                70.00
             |           
            
                70.40
             |               
            
                70.00
             |                           
            
                70.40
             | 
            
                70.05
             |                     
            
                26.99
             |                                 
            
                21,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/16/2017
             | 
            
                -0.20 / -0.28%
             |             
            
                70.50
             |           
            
                71.00
             |               
            
                69.90
             |                           
            
                70.00
             | 
            
                70.61
             |                     
            
                26.84
             |                                 
            
                56,800
             |            
            
                 
             |                                       
         
    
        
            | 
                11/15/2017
             | 
            
                +1.40 / +2.03%
             |             
            
                67.60
             |           
            
                70.30
             |               
            
                67.50
             |                           
            
                70.20
             | 
            
                69.94
             |                     
            
                26.91
             |                                 
            
                71,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/14/2017
             | 
            
                0.00 / 0.00%
             |             
            
                68.80
             |           
            
                68.80
             |               
            
                68.20
             |                           
            
                68.80
             | 
            
                68.40
             |                     
            
                26.38
             |                                 
            
                50,400
             |            
            
                 
             |                                       
         
    
        
            | 
                11/13/2017
             | 
            
                0.00 / 0.00%
             |             
            
                69.70
             |           
            
                69.70
             |               
            
                68.50
             |                           
            
                68.80
             | 
            
                68.74
             |                     
            
                26.38
             |                                 
            
                19,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/10/2017
             | 
            
                -0.60 / -0.87%
             |             
            
                69.50
             |           
            
                69.50
             |               
            
                68.50
             |                           
            
                68.50
             | 
            
                68.80
             |                     
            
                26.26
             |                                 
            
                7,200
             |            
            
                 
             |                                       
         
    
        
            | 
                11/9/2017
             | 
            
                -0.90 / -1.29%
             |             
            
                69.50
             |           
            
                69.50
             |               
            
                69.00
             |                           
            
                69.10
             | 
            
                69.27
             |                     
            
                26.49
             |                                 
            
                11,600
             |  
            
                 
             |                                                              
             
    
         
    
    
 |