| 
                 
                    Closing price on 3/13/2015
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    10.90 | 
                 
                
                    | High | 
                    11.90 | 
                 
                
                    | Low | 
                    10.90 | 
                     
                
                    | Volume | 
                    9,100 | 
                                 
                
                    | Split-adjusted Price | 
                    7.16 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NST Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/13/2015
             | 
            
                -0.40 / -3.33%
             |             
            
                10.90
             |           
            
                11.90
             |               
            
                10.90
             |                           
            
                11.60
             | 
            
                11.20
             |                     
            
                7.16
             |                                 
            
                9,100
             |            
            
                 
             |                                       
         
    
        
            | 
                3/12/2015
             | 
            
                +0.60 / +5.26%
             |             
            
                12.20
             |           
            
                12.20
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.20
             |                     
            
                7.41
             |                                 
            
                500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/11/2015
             | 
            
                -0.60 / -5.00%
             |             
            
                10.80
             |           
            
                11.50
             |               
            
                10.80
             |                           
            
                11.40
             | 
            
                11.15
             |                     
            
                7.04
             |                                 
            
                400
             |            
            
                 
             |                                       
         
    
        
            | 
                3/10/2015
             | 
            
                +0.20 / +1.69%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                7.41
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/9/2015
             | 
            
                +1.00 / +9.26%
             |             
            
                11.70
             |           
            
                11.80
             |               
            
                11.70
             |                           
            
                11.80
             | 
            
                11.70
             |                     
            
                7.28
             |                                 
            
                200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/6/2015
             | 
            
                -0.90 / -7.69%
             |             
            
                12.20
             |           
            
                12.20
             |               
            
                10.80
             |                           
            
                10.80
             | 
            
                11.04
             |                     
            
                6.67
             |                                 
            
                3,597
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/5/2015
             | 
            
                +0.30 / +2.63%
             |             
            
                12.20
             |           
            
                12.20
             |               
            
                11.70
             |                           
            
                11.70
             | 
            
                12.20
             |                     
            
                7.22
             |                                 
            
                500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/4/2015
             | 
            
                -1.00 / -8.06%
             |             
            
                11.20
             |           
            
                12.20
             |               
            
                11.20
             |                           
            
                11.40
             | 
            
                11.28
             |                     
            
                7.04
             |                                 
            
                1,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/3/2015
             | 
            
                0.00 / 0.00%
             |             
            
                12.40
             |           
            
                12.40
             |               
            
                12.40
             |                           
            
                12.40
             | 
            
                12.40
             |                     
            
                7.65
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                3/2/2015
             | 
            
                +1.00 / +8.77%
             |             
            
                12.40
             |           
            
                12.40
             |               
            
                12.40
             |                           
            
                12.40
             | 
            
                12.40
             |                     
            
                7.65
             |                                 
            
                300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/27/2015
             | 
            
                +0.10 / +0.88%
             |             
            
                11.40
             |           
            
                11.40
             |               
            
                11.40
             |                           
            
                11.40
             | 
            
                11.40
             |                     
            
                7.04
             |                                 
            
                600
             |            
            
                 
             |                                       
         
    
        
            | 
                2/26/2015
             | 
            
                +1.00 / +9.71%
             |             
            
                10.30
             |           
            
                11.30
             |               
            
                10.30
             |                           
            
                11.30
             | 
            
                10.52
             |                     
            
                6.98
             |                                 
            
                15,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/25/2015
             | 
            
                +0.10 / +0.98%
             |             
            
                10.30
             |           
            
                10.30
             |               
            
                10.30
             |                           
            
                10.30
             | 
            
                10.30
             |                     
            
                6.36
             |                                 
            
                3,100
             |            
            
                 
             |                                       
         
    
        
            | 
                2/24/2015
             | 
            
                -1.10 / -9.73%
             |             
            
                11.90
             |           
            
                11.90
             |               
            
                10.20
             |                           
            
                10.20
             | 
            
                10.67
             |                     
            
                6.30
             |                                 
            
                2,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/13/2015
             | 
            
                0.00 / 0.00%
             |             
            
                11.30
             |           
            
                11.30
             |               
            
                11.30
             |                           
            
                11.30
             | 
            
                11.30
             |                     
            
                6.98
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                2/12/2015
             | 
            
                -0.60 / -5.04%
             |             
            
                11.30
             |           
            
                11.30
             |               
            
                11.30
             |                           
            
                11.30
             | 
            
                11.30
             |                     
            
                6.98
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/11/2015
             | 
            
                0.00 / 0.00%
             |             
            
                11.90
             |           
            
                11.90
             |               
            
                11.90
             |                           
            
                11.90
             | 
            
                11.90
             |                     
            
                7.35
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                2/10/2015
             | 
            
                -0.10 / -0.83%
             |             
            
                11.90
             |           
            
                11.90
             |               
            
                11.90
             |                           
            
                11.90
             | 
            
                11.90
             |                     
            
                7.35
             |                                 
            
                400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/9/2015
             | 
            
                0.00 / 0.00%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                7.41
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                2/6/2015
             | 
            
                0.00 / 0.00%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                7.41
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/5/2015
             | 
            
                0.00 / 0.00%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                7.41
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                2/4/2015
             | 
            
                -0.10 / -0.83%
             |             
            
                11.00
             |           
            
                12.00
             |               
            
                11.00
             |                           
            
                12.00
             | 
            
                11.12
             |                     
            
                7.41
             |                                 
            
                1,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/3/2015
             | 
            
                -0.20 / -1.63%
             |             
            
                12.10
             |           
            
                12.10
             |               
            
                12.10
             |                           
            
                12.10
             | 
            
                12.10
             |                     
            
                7.47
             |                                 
            
                1,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/2/2015
             | 
            
                0.00 / 0.00%
             |             
            
                12.30
             |           
            
                12.30
             |               
            
                12.30
             |                           
            
                12.30
             | 
            
                12.30
             |                     
            
                7.59
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/30/2015
             | 
            
                +0.30 / +2.50%
             |             
            
                12.30
             |           
            
                12.30
             |               
            
                12.30
             |                           
            
                12.30
             | 
            
                12.30
             |                     
            
                7.59
             |                                 
            
                300
             |            
            
                 
             |                                       
         
    
        
            | 
                1/29/2015
             | 
            
                0.00 / 0.00%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                7.41
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/28/2015
             | 
            
                -0.20 / -1.64%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                7.41
             |                                 
            
                300
             |            
            
                 
             |                                       
         
    
        
            | 
                1/27/2015
             | 
            
                +0.30 / +2.52%
             |             
            
                12.20
             |           
            
                12.20
             |               
            
                12.20
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                7.53
             |                                 
            
                183
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/26/2015
             | 
            
                +0.10 / +0.85%
             |             
            
                11.50
             |           
            
                11.90
             |               
            
                11.50
             |                           
            
                11.90
             | 
            
                11.50
             |                     
            
                7.35
             |                                 
            
                300
             |            
            
                 
             |                                       
         
    
        
            | 
                1/23/2015
             | 
            
                -0.10 / -0.84%
             |             
            
                11.20
             |           
            
                11.80
             |               
            
                11.20
             |                           
            
                11.80
             | 
            
                11.23
             |                     
            
                7.28
             |                                 
            
                3,400
             |  
            
                 
             |                                                              
             
    
         
    
    
 |