| 
                 
                    Closing price on 9/21/2018
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    23.50 | 
                 
                
                    | High | 
                    28.00 | 
                 
                
                    | Low | 
                    22.80 | 
                     
                
                    | Volume | 
                    4,200 | 
                                 
                
                    | Split-adjusted Price | 
                    12.33 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
DSC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/21/2018
             | 
            
                +0.30 / +1.08%
             |             
            
                23.50
             |           
            
                28.00
             |               
            
                22.80
             |                           
            
                28.00
             | 
            
                26.74
             |                     
            
                12.33
             |                                 
            
                4,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/20/2018
             | 
            
                +0.70 / +2.59%
             |             
            
                30.00
             |           
            
                30.80
             |               
            
                23.70
             |                           
            
                27.70
             | 
            
                26.15
             |                     
            
                12.20
             |                                 
            
                16,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/19/2018
             | 
            
                -2.30 / -7.85%
             |             
            
                27.20
             |           
            
                29.90
             |               
            
                27.00
             |                           
            
                27.00
             | 
            
                27.31
             |                     
            
                11.89
             |                                 
            
                5,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/18/2018
             | 
            
                -4.30 / -12.80%
             |             
            
                32.70
             |           
            
                32.70
             |               
            
                29.00
             |                           
            
                29.30
             | 
            
                30.51
             |                     
            
                12.90
             |                                 
            
                19,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/17/2018
             | 
            
                -2.20 / -6.15%
             |             
            
                37.90
             |           
            
                38.00
             |               
            
                33.20
             |                           
            
                33.60
             | 
            
                33.95
             |                     
            
                14.80
             |                                 
            
                17,900
             |            
            
                 
             |                                       
         
    
        
            | 
                9/14/2018
             | 
            
                +2.30 / +6.82%
             |             
            
                37.40
             |           
            
                37.90
             |               
            
                34.20
             |                           
            
                36.00
             | 
            
                35.80
             |                     
            
                15.85
             |                                 
            
                4,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/13/2018
             | 
            
                -4.20 / -11.08%
             |             
            
                34.00
             |           
            
                38.80
             |               
            
                33.30
             |                           
            
                33.70
             | 
            
                34.19
             |                     
            
                14.84
             |                                 
            
                24,400
             |            
            
                 
             |                                       
         
    
        
            | 
                9/12/2018
             | 
            
                -5.10 / -11.86%
             |             
            
                46.00
             |           
            
                46.00
             |               
            
                37.90
             |                           
            
                37.90
             | 
            
                38.80
             |                     
            
                16.69
             |                                 
            
                7,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/11/2018
             | 
            
                -5.00 / -10.42%
             |             
            
                43.50
             |           
            
                48.20
             |               
            
                43.00
             |                           
            
                43.00
             | 
            
                44.47
             |                     
            
                18.94
             |                                 
            
                5,100
             |            
            
                 
             |                                       
         
    
        
            | 
                9/10/2018
             | 
            
                -1.80 / -3.61%
             |             
            
                48.80
             |           
            
                48.90
             |               
            
                48.00
             |                           
            
                48.00
             | 
            
                48.56
             |                     
            
                21.14
             |                                 
            
                800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/7/2018
             | 
            
                -1.90 / -3.73%
             |             
            
                50.00
             |           
            
                50.90
             |               
            
                49.00
             |                           
            
                49.00
             | 
            
                49.84
             |                     
            
                21.58
             |                                 
            
                7,100
             |            
            
                 
             |                                       
         
    
        
            | 
                9/6/2018
             | 
            
                +0.80 / +1.60%
             |             
            
                49.00
             |           
            
                50.90
             |               
            
                49.00
             |                           
            
                50.90
             | 
            
                49.95
             |                     
            
                22.41
             |                                 
            
                400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/5/2018
             | 
            
                -2.70 / -5.11%
             |             
            
                52.70
             |           
            
                53.00
             |               
            
                50.00
             |                           
            
                50.10
             | 
            
                51.54
             |                     
            
                22.06
             |                                 
            
                500
             |            
            
                 
             |                                       
         
    
        
            | 
                9/4/2018
             | 
            
                +2.00 / +3.94%
             |             
            
                52.80
             |           
            
                52.80
             |               
            
                52.80
             |                           
            
                52.80
             | 
            
                52.80
             |                     
            
                23.25
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/31/2018
             | 
            
                -3.30 / -6.17%
             |             
            
                53.30
             |           
            
                53.30
             |               
            
                50.20
             |                           
            
                50.20
             | 
            
                50.75
             |                     
            
                22.11
             |                                 
            
                1,600
             |            
            
                 
             |                                       
         
    
        
            | 
                8/30/2018
             | 
            
                +1.00 / +1.90%
             |             
            
                51.00
             |           
            
                53.50
             |               
            
                51.00
             |                           
            
                53.50
             | 
            
                53.19
             |                     
            
                23.56
             |                                 
            
                1,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/29/2018
             | 
            
                +0.10 / +0.19%
             |             
            
                53.50
             |           
            
                53.50
             |               
            
                50.00
             |                           
            
                52.50
             | 
            
                51.78
             |                     
            
                23.12
             |                                 
            
                6,500
             |            
            
                 
             |                                       
         
    
        
            | 
                8/28/2018
             | 
            
                +0.40 / +0.77%
             |             
            
                52.40
             |           
            
                52.70
             |               
            
                52.40
             |                           
            
                52.40
             | 
            
                52.48
             |                     
            
                23.08
             |                                 
            
                800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/27/2018
             | 
            
                -2.80 / -5.11%
             |             
            
                52.00
             |           
            
                53.00
             |               
            
                52.00
             |                           
            
                52.00
             | 
            
                52.32
             |                     
            
                22.90
             |                                 
            
                17,500
             |            
            
                 
             |                                       
         
    
        
            | 
                8/24/2018
             | 
            
                +0.90 / +1.73%
             |             
            
                56.00
             |           
            
                56.00
             |               
            
                52.80
             |                           
            
                52.80
             | 
            
                54.83
             |                     
            
                23.25
             |                                 
            
                300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/23/2018
             | 
            
                +1.80 / +3.59%
             |             
            
                50.40
             |           
            
                52.00
             |               
            
                50.40
             |                           
            
                51.90
             | 
            
                50.86
             |                     
            
                22.86
             |                                 
            
                1,000
             |            
            
                 
             |                                       
         
    
        
            | 
                8/22/2018
             | 
            
                -0.90 / -1.76%
             |             
            
                52.60
             |           
            
                52.60
             |               
            
                50.00
             |                           
            
                50.10
             | 
            
                50.44
             |                     
            
                22.06
             |                                 
            
                2,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/21/2018
             | 
            
                +1.00 / +2.00%
             |             
            
                53.20
             |           
            
                53.20
             |               
            
                50.00
             |                           
            
                51.00
             | 
            
                52.39
             |                     
            
                22.46
             |                                 
            
                4,400
             |            
            
                 
             |                                       
         
    
        
            | 
                8/20/2018
             | 
            
                -2.60 / -4.94%
             |             
            
                52.60
             |           
            
                53.50
             |               
            
                50.00
             |                           
            
                50.00
             | 
            
                52.08
             |                     
            
                22.02
             |                                 
            
                6,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/17/2018
             | 
            
                -0.90 / -1.66%
             |             
            
                55.80
             |           
            
                55.80
             |               
            
                50.50
             |                           
            
                53.20
             | 
            
                52.58
             |                     
            
                23.43
             |                                 
            
                13,800
             |            
            
                 
             |                                       
         
    
        
            | 
                8/16/2018
             | 
            
                +0.10 / +0.19%
             |             
            
                54.50
             |           
            
                54.50
             |               
            
                52.50
             |                           
            
                54.10
             | 
            
                54.29
             |                     
            
                23.82
             |                                 
            
                19,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/15/2018
             | 
            
                +0.30 / +0.56%
             |             
            
                58.90
             |           
            
                58.90
             |               
            
                54.00
             |                           
            
                54.00
             | 
            
                55.94
             |                     
            
                23.78
             |                                 
            
                22,200
             |            
            
                 
             |                                       
         
    
        
            | 
                8/14/2018
             | 
            
                -0.50 / -0.92%
             |             
            
                51.80
             |           
            
                53.90
             |               
            
                51.80
             |                           
            
                53.70
             | 
            
                53.72
             |                     
            
                23.65
             |                                 
            
                32,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/13/2018
             | 
            
                0.00 / 0.00%
             |             
            
                54.80
             |           
            
                54.80
             |               
            
                51.50
             |                           
            
                54.20
             | 
            
                53.75
             |                     
            
                23.87
             |                                 
            
                12,000
             |            
            
                 
             |                                       
         
    
        
            | 
                8/10/2018
             | 
            
                -0.10 / -0.18%
             |             
            
                56.50
             |           
            
                56.50
             |               
            
                53.00
             |                           
            
                55.90
             | 
            
                54.23
             |                     
            
                24.62
             |                                 
            
                2,000
             |  
            
                 
             |                                                              
             
    
         
    
    
 |