| 
                 
                    Closing price on 3/8/2018
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    82.10 | 
                 
                
                    | High | 
                    84.10 | 
                 
                
                    | Low | 
                    82.10 | 
                     
                
                    | Volume | 
                    19,200 | 
                                 
                
                    | Split-adjusted Price | 
                    32.20 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NTC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/8/2018
             | 
            
                +1.20 / +1.45%
             |             
            
                82.10
             |           
            
                84.10
             |               
            
                82.10
             |                           
            
                84.00
             | 
            
                83.11
             |                     
            
                32.20
             |                                 
            
                19,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2018
             | 
            
                -1.10 / -1.31%
             |             
            
                83.50
             |           
            
                84.00
             |               
            
                82.80
             |                           
            
                82.80
             | 
            
                83.38
             |                     
            
                31.74
             |                                 
            
                27,330
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/6/2018
             | 
            
                +1.30 / +1.57%
             |             
            
                84.90
             |           
            
                84.90
             |               
            
                82.00
             |                           
            
                83.90
             | 
            
                84.10
             |                     
            
                32.16
             |                                 
            
                14,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/5/2018
             | 
            
                -1.70 / -2.02%
             |             
            
                84.30
             |           
            
                84.30
             |               
            
                82.50
             |                           
            
                82.60
             | 
            
                83.44
             |                     
            
                31.67
             |                                 
            
                14,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/2/2018
             | 
            
                +0.40 / +0.47%
             |             
            
                84.50
             |           
            
                84.90
             |               
            
                83.50
             |                           
            
                84.90
             | 
            
                84.31
             |                     
            
                32.55
             |                                 
            
                6,510
             |            
            
                 
             |                                       
         
    
        
            | 
                3/1/2018
             | 
            
                -0.60 / -0.71%
             |             
            
                84.50
             |           
            
                85.80
             |               
            
                84.50
             |                           
            
                84.50
             | 
            
                84.66
             |                     
            
                32.39
             |                                 
            
                22,050
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/28/2018
             | 
            
                +0.60 / +0.71%
             |             
            
                86.40
             |           
            
                86.40
             |               
            
                84.20
             |                           
            
                85.10
             | 
            
                85.05
             |                     
            
                32.62
             |                                 
            
                18,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/27/2018
             | 
            
                -1.10 / -1.29%
             |             
            
                86.70
             |           
            
                86.70
             |               
            
                84.50
             |                           
            
                84.50
             | 
            
                85.19
             |                     
            
                32.39
             |                                 
            
                23,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/26/2018
             | 
            
                -0.50 / -0.58%
             |             
            
                84.50
             |           
            
                87.90
             |               
            
                84.50
             |                           
            
                85.60
             | 
            
                85.82
             |                     
            
                32.82
             |                                 
            
                24,180
             |            
            
                 
             |                                       
         
    
        
            | 
                2/23/2018
             | 
            
                +2.80 / +3.33%
             |             
            
                86.90
             |           
            
                86.90
             |               
            
                84.10
             |                           
            
                86.80
             | 
            
                86.09
             |                     
            
                33.28
             |                                 
            
                6,220
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/22/2018
             | 
            
                -0.20 / -0.24%
             |             
            
                86.50
             |           
            
                86.50
             |               
            
                84.00
             |                           
            
                84.00
             | 
            
                84.29
             |                     
            
                32.20
             |                                 
            
                8,100
             |            
            
                 
             |                                       
         
    
        
            | 
                2/21/2018
             | 
            
                0.00 / 0.00%
             |             
            
                87.50
             |           
            
                87.50
             |               
            
                84.20
             |                           
            
                84.20
             | 
            
                84.46
             |                     
            
                32.28
             |                                 
            
                15,745
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/13/2018
             | 
            
                +4.70 / +5.75%
             |             
            
                89.90
             |           
            
                89.90
             |               
            
                83.00
             |                           
            
                86.50
             | 
            
                84.22
             |                     
            
                33.16
             |                                 
            
                12,700
             |            
            
                 
             |                                       
         
    
        
            | 
                2/12/2018
             | 
            
                0.00 / 0.00%
             |             
            
                81.80
             |           
            
                83.70
             |               
            
                81.80
             |                           
            
                81.80
             | 
            
                82.19
             |                     
            
                31.36
             |                                 
            
                3,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/9/2018
             | 
            
                +0.90 / +1.11%
             |             
            
                78.00
             |           
            
                81.90
             |               
            
                78.00
             |                           
            
                81.90
             | 
            
                81.78
             |                     
            
                31.40
             |                                 
            
                9,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/8/2018
             | 
            
                -0.90 / -1.10%
             |             
            
                81.00
             |           
            
                84.50
             |               
            
                81.00
             |                           
            
                81.00
             | 
            
                81.11
             |                     
            
                31.05
             |                                 
            
                17,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/7/2018
             | 
            
                +2.70 / +3.41%
             |             
            
                82.00
             |           
            
                82.00
             |               
            
                78.50
             |                           
            
                81.90
             | 
            
                80.42
             |                     
            
                31.40
             |                                 
            
                19,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/6/2018
             | 
            
                -2.70 / -3.30%
             |             
            
                80.00
             |           
            
                80.00
             |               
            
                74.00
             |                           
            
                79.20
             | 
            
                76.47
             |                     
            
                30.36
             |                                 
            
                57,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/5/2018
             | 
            
                -3.60 / -4.21%
             |             
            
                87.50
             |           
            
                87.50
             |               
            
                81.90
             |                           
            
                81.90
             | 
            
                82.98
             |                     
            
                31.40
             |                                 
            
                119,250
             |            
            
                 
             |                                       
         
    
        
            | 
                2/2/2018
             | 
            
                -1.90 / -2.19%
             |             
            
                87.10
             |           
            
                87.10
             |               
            
                83.50
             |                           
            
                85.00
             | 
            
                85.51
             |                     
            
                32.59
             |                                 
            
                37,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/1/2018
             | 
            
                -0.60 / -0.69%
             |             
            
                87.00
             |           
            
                87.00
             |               
            
                84.50
             |                           
            
                86.90
             | 
            
                85.33
             |                     
            
                33.31
             |                                 
            
                18,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/31/2018
             | 
            
                +3.90 / +4.67%
             |             
            
                83.00
             |           
            
                87.50
             |               
            
                83.00
             |                           
            
                87.50
             | 
            
                86.12
             |                     
            
                33.54
             |                                 
            
                38,230
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/30/2018
             | 
            
                -0.90 / -1.07%
             |             
            
                83.50
             |           
            
                84.70
             |               
            
                83.00
             |                           
            
                83.60
             | 
            
                83.05
             |                     
            
                32.05
             |                                 
            
                57,100
             |            
            
                 
             |                                       
         
    
        
            | 
                1/29/2018
             | 
            
                +1.50 / +1.81%
             |             
            
                92.90
             |           
            
                92.90
             |               
            
                83.00
             |                           
            
                84.50
             | 
            
                84.70
             |                     
            
                32.39
             |                                 
            
                24,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/26/2018
             | 
            
                0.00 / 0.00%
             |             
            
                83.00
             |           
            
                83.80
             |               
            
                82.70
             |                           
            
                83.00
             | 
            
                83.01
             |                     
            
                31.82
             |                                 
            
                97,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/25/2018
             | 
            
                -2.30 / -2.70%
             |             
            
                86.50
             |           
            
                86.50
             |               
            
                82.00
             |                           
            
                83.00
             | 
            
                83.53
             |                     
            
                31.82
             |                                 
            
                150,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/24/2018
             | 
            
                -1.30 / -1.50%
             |             
            
                89.90
             |           
            
                89.90
             |               
            
                85.30
             |                           
            
                85.30
             | 
            
                86.06
             |                     
            
                32.70
             |                                 
            
                74,439
             |            
            
                 
             |                                       
         
    
        
            | 
                1/23/2018
             | 
            
                -1.90 / -2.15%
             |             
            
                88.90
             |           
            
                88.90
             |               
            
                85.30
             |                           
            
                86.60
             | 
            
                86.47
             |                     
            
                33.20
             |                                 
            
                61,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/22/2018
             | 
            
                -1.50 / -1.67%
             |             
            
                91.40
             |           
            
                91.40
             |               
            
                88.50
             |                           
            
                88.50
             | 
            
                89.16
             |                     
            
                33.93
             |                                 
            
                35,922
             |            
            
                 
             |                                       
         
    
        
            | 
                1/19/2018
             | 
            
                +1.40 / +1.58%
             |             
            
                90.90
             |           
            
                91.00
             |               
            
                88.00
             |                           
            
                90.00
             | 
            
                89.96
             |                     
            
                34.50
             |                                 
            
                104,240
             |  
            
                 
             |                                                              
             
    
         
    
    
 |