| 
                 
                    Closing price on 4/1/2021
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    8.40 | 
                 
                
                    | High | 
                    8.60 | 
                 
                
                    | Low | 
                    8.30 | 
                     
                
                    | Volume | 
                    21,800 | 
                                 
                
                    | Split-adjusted Price | 
                    6.89 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NST Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/1/2021
             | 
            
                +0.10 / +1.19%
             |             
            
                8.40
             |           
            
                8.60
             |               
            
                8.30
             |                           
            
                8.50
             | 
            
                8.43
             |                     
            
                6.89
             |                                 
            
                21,800
             |            
            
                 
             |                                       
         
    
        
            | 
                3/31/2021
             | 
            
                -0.10 / -1.18%
             |             
            
                8.60
             |           
            
                8.60
             |               
            
                8.40
             |                           
            
                8.40
             | 
            
                8.48
             |                     
            
                6.81
             |                                 
            
                14,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/30/2021
             | 
            
                +0.10 / +1.19%
             |             
            
                8.60
             |           
            
                8.70
             |               
            
                8.30
             |                           
            
                8.50
             | 
            
                8.46
             |                     
            
                6.89
             |                                 
            
                12,800
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2021
             | 
            
                0.00 / 0.00%
             |             
            
                8.40
             |           
            
                8.50
             |               
            
                8.30
             |                           
            
                8.40
             | 
            
                8.41
             |                     
            
                6.81
             |                                 
            
                3,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/26/2021
             | 
            
                0.00 / 0.00%
             |             
            
                8.40
             |           
            
                8.40
             |               
            
                8.10
             |                           
            
                8.40
             | 
            
                8.26
             |                     
            
                6.81
             |                                 
            
                16,000
             |            
            
                 
             |                                       
         
    
        
            | 
                3/25/2021
             | 
            
                -0.10 / -1.18%
             |             
            
                8.30
             |           
            
                8.50
             |               
            
                8.30
             |                           
            
                8.40
             | 
            
                8.33
             |                     
            
                6.81
             |                                 
            
                19,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/24/2021
             | 
            
                -0.10 / -1.16%
             |             
            
                8.70
             |           
            
                8.70
             |               
            
                8.20
             |                           
            
                8.50
             | 
            
                8.32
             |                     
            
                6.89
             |                                 
            
                16,900
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2021
             | 
            
                -0.10 / -1.15%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.60
             |                           
            
                8.60
             | 
            
                8.64
             |                     
            
                6.97
             |                                 
            
                27,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/22/2021
             | 
            
                -0.10 / -1.14%
             |             
            
                8.80
             |           
            
                8.80
             |               
            
                8.70
             |                           
            
                8.70
             | 
            
                8.75
             |                     
            
                7.06
             |                                 
            
                14,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/19/2021
             | 
            
                -0.10 / -1.12%
             |             
            
                8.80
             |           
            
                8.80
             |               
            
                8.50
             |                           
            
                8.80
             | 
            
                8.69
             |                     
            
                7.14
             |                                 
            
                28,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/18/2021
             | 
            
                +0.10 / +1.14%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.70
             |                           
            
                8.90
             | 
            
                8.81
             |                     
            
                7.22
             |                                 
            
                15,400
             |            
            
                 
             |                                       
         
    
        
            | 
                3/17/2021
             | 
            
                -0.10 / -1.12%
             |             
            
                8.80
             |           
            
                8.80
             |               
            
                8.70
             |                           
            
                8.80
             | 
            
                8.73
             |                     
            
                7.14
             |                                 
            
                13,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2021
             | 
            
                +0.10 / +1.14%
             |             
            
                8.80
             |           
            
                8.90
             |               
            
                8.80
             |                           
            
                8.90
             | 
            
                8.80
             |                     
            
                7.22
             |                                 
            
                20,100
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2021
             | 
            
                0.00 / 0.00%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.70
             |                           
            
                8.80
             | 
            
                8.73
             |                     
            
                7.14
             |                                 
            
                49,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/12/2021
             | 
            
                0.00 / 0.00%
             |             
            
                8.80
             |           
            
                8.90
             |               
            
                8.70
             |                           
            
                8.80
             | 
            
                8.80
             |                     
            
                7.14
             |                                 
            
                19,400
             |            
            
                 
             |                                       
         
    
        
            | 
                3/11/2021
             | 
            
                -0.20 / -2.22%
             |             
            
                9.20
             |           
            
                9.20
             |               
            
                8.60
             |                           
            
                8.80
             | 
            
                8.82
             |                     
            
                7.14
             |                                 
            
                31,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/10/2021
             | 
            
                -0.20 / -2.17%
             |             
            
                9.90
             |           
            
                9.90
             |               
            
                8.80
             |                           
            
                9.00
             | 
            
                9.08
             |                     
            
                7.30
             |                                 
            
                36,400
             |            
            
                 
             |                                       
         
    
        
            | 
                3/9/2021
             | 
            
                +0.70 / +8.24%
             |             
            
                8.50
             |           
            
                9.30
             |               
            
                8.50
             |                           
            
                9.20
             | 
            
                9.02
             |                     
            
                7.46
             |                                 
            
                78,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/8/2021
             | 
            
                +0.20 / +2.41%
             |             
            
                8.40
             |           
            
                8.60
             |               
            
                8.40
             |                           
            
                8.50
             | 
            
                8.54
             |                     
            
                6.89
             |                                 
            
                78,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/5/2021
             | 
            
                +0.30 / +3.75%
             |             
            
                8.00
             |           
            
                8.30
             |               
            
                7.90
             |                           
            
                8.30
             | 
            
                8.08
             |                     
            
                6.73
             |                                 
            
                28,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/4/2021
             | 
            
                0.00 / 0.00%
             |             
            
                8.00
             |           
            
                8.00
             |               
            
                7.90
             |                           
            
                8.00
             | 
            
                8.00
             |                     
            
                6.49
             |                                 
            
                33,300
             |            
            
                 
             |                                       
         
    
        
            | 
                3/3/2021
             | 
            
                -0.10 / -1.23%
             |             
            
                8.00
             |           
            
                8.10
             |               
            
                8.00
             |                           
            
                8.00
             | 
            
                8.02
             |                     
            
                6.49
             |                                 
            
                10,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/2/2021
             | 
            
                -0.10 / -1.22%
             |             
            
                8.20
             |           
            
                8.20
             |               
            
                8.10
             |                           
            
                8.10
             | 
            
                8.11
             |                     
            
                6.57
             |                                 
            
                19,600
             |            
            
                 
             |                                       
         
    
        
            | 
                3/1/2021
             | 
            
                0.00 / 0.00%
             |             
            
                8.20
             |           
            
                8.20
             |               
            
                8.00
             |                           
            
                8.20
             | 
            
                8.08
             |                     
            
                6.65
             |                                 
            
                5,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/26/2021
             | 
            
                -0.10 / -1.20%
             |             
            
                8.00
             |           
            
                8.20
             |               
            
                7.90
             |                           
            
                8.20
             | 
            
                8.01
             |                     
            
                6.65
             |                                 
            
                19,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/25/2021
             | 
            
                +0.30 / +3.75%
             |             
            
                8.00
             |           
            
                8.30
             |               
            
                7.80
             |                           
            
                8.30
             | 
            
                7.92
             |                     
            
                6.73
             |                                 
            
                29,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/24/2021
             | 
            
                +0.10 / +1.27%
             |             
            
                7.80
             |           
            
                8.30
             |               
            
                7.80
             |                           
            
                8.00
             | 
            
                8.03
             |                     
            
                6.49
             |                                 
            
                69,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/23/2021
             | 
            
                +0.10 / +1.28%
             |             
            
                7.80
             |           
            
                7.90
             |               
            
                7.80
             |                           
            
                7.90
             | 
            
                7.80
             |                     
            
                6.41
             |                                 
            
                8,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/22/2021
             | 
            
                +0.20 / +2.63%
             |             
            
                7.70
             |           
            
                8.00
             |               
            
                7.70
             |                           
            
                7.80
             | 
            
                7.77
             |                     
            
                6.33
             |                                 
            
                29,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/19/2021
             | 
            
                0.00 / 0.00%
             |             
            
                7.50
             |           
            
                7.70
             |               
            
                7.40
             |                           
            
                7.60
             | 
            
                7.47
             |                     
            
                6.16
             |                                 
            
                10,200
             |  
            
                 
             |                                                              
             
    
         
    
    
 |