| 
                 
                    Closing price on 4/4/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    1.60 | 
                 
                
                    | High | 
                    1.60 | 
                 
                
                    | Low | 
                    1.56 | 
                     
                
                    | Volume | 
                    402,280 | 
                                 
                
                    | Split-adjusted Price | 
                    1.49 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VOS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/4/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.60
             |           
            
                1.60
             |               
            
                1.56
             |                           
            
                1.60
             | 
            
                1.59
             |                     
            
                1.49
             |                                 
            
                402,280
             |            
            
                 
             |                                       
         
    
        
            | 
                4/3/2019
             | 
            
                +0.01 / +0.63%
             |             
            
                1.61
             |           
            
                1.61
             |               
            
                1.58
             |                           
            
                1.60
             | 
            
                1.59
             |                     
            
                1.49
             |                                 
            
                35,220
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/2/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.57
             |           
            
                1.62
             |               
            
                1.55
             |                           
            
                1.59
             | 
            
                1.57
             |                     
            
                1.48
             |                                 
            
                146,400
             |            
            
                 
             |                                       
         
    
        
            | 
                4/1/2019
             | 
            
                +0.01 / +0.63%
             |             
            
                1.58
             |           
            
                1.60
             |               
            
                1.58
             |                           
            
                1.59
             | 
            
                1.59
             |                     
            
                1.48
             |                                 
            
                33,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/29/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.66
             |           
            
                1.66
             |               
            
                1.58
             |                           
            
                1.58
             | 
            
                1.60
             |                     
            
                1.47
             |                                 
            
                64,260
             |            
            
                 
             |                                       
         
    
        
            | 
                3/28/2019
             | 
            
                -0.02 / -1.25%
             |             
            
                1.64
             |           
            
                1.64
             |               
            
                1.57
             |                           
            
                1.58
             | 
            
                1.59
             |                     
            
                1.47
             |                                 
            
                57,950
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/27/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.58
             |           
            
                1.63
             |               
            
                1.58
             |                           
            
                1.60
             | 
            
                1.60
             |                     
            
                1.49
             |                                 
            
                24,690
             |            
            
                 
             |                                       
         
    
        
            | 
                3/26/2019
             | 
            
                +0.03 / +1.91%
             |             
            
                1.64
             |           
            
                1.64
             |               
            
                1.57
             |                           
            
                1.60
             | 
            
                1.58
             |                     
            
                1.49
             |                                 
            
                12,620
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/25/2019
             | 
            
                -0.05 / -3.09%
             |             
            
                1.66
             |           
            
                1.66
             |               
            
                1.57
             |                           
            
                1.57
             | 
            
                1.60
             |                     
            
                1.46
             |                                 
            
                85,660
             |            
            
                 
             |                                       
         
    
        
            | 
                3/22/2019
             | 
            
                -0.01 / -0.61%
             |             
            
                1.66
             |           
            
                1.66
             |               
            
                1.61
             |                           
            
                1.62
             | 
            
                1.62
             |                     
            
                1.51
             |                                 
            
                41,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/21/2019
             | 
            
                -0.01 / -0.61%
             |             
            
                1.69
             |           
            
                1.69
             |               
            
                1.61
             |                           
            
                1.63
             | 
            
                1.62
             |                     
            
                1.52
             |                                 
            
                59,860
             |            
            
                 
             |                                       
         
    
        
            | 
                3/20/2019
             | 
            
                -0.05 / -2.96%
             |             
            
                1.65
             |           
            
                1.68
             |               
            
                1.62
             |                           
            
                1.64
             | 
            
                1.65
             |                     
            
                1.53
             |                                 
            
                166,810
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/19/2019
             | 
            
                +0.03 / +1.81%
             |             
            
                1.62
             |           
            
                1.69
             |               
            
                1.62
             |                           
            
                1.69
             | 
            
                1.67
             |                     
            
                1.57
             |                                 
            
                89,320
             |            
            
                 
             |                                       
         
    
        
            | 
                3/18/2019
             | 
            
                -0.02 / -1.19%
             |             
            
                1.68
             |           
            
                1.70
             |               
            
                1.64
             |                           
            
                1.66
             | 
            
                1.65
             |                     
            
                1.55
             |                                 
            
                123,630
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/15/2019
             | 
            
                +0.01 / +0.60%
             |             
            
                1.68
             |           
            
                1.69
             |               
            
                1.65
             |                           
            
                1.68
             | 
            
                1.67
             |                     
            
                1.56
             |                                 
            
                78,040
             |            
            
                 
             |                                       
         
    
        
            | 
                3/14/2019
             | 
            
                -0.02 / -1.18%
             |             
            
                1.69
             |           
            
                1.70
             |               
            
                1.64
             |                           
            
                1.67
             | 
            
                1.66
             |                     
            
                1.55
             |                                 
            
                126,440
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/13/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.70
             |           
            
                1.70
             |               
            
                1.65
             |                           
            
                1.69
             | 
            
                1.68
             |                     
            
                1.57
             |                                 
            
                42,230
             |            
            
                 
             |                                       
         
    
        
            | 
                3/12/2019
             | 
            
                +0.04 / +2.42%
             |             
            
                1.70
             |           
            
                1.70
             |               
            
                1.65
             |                           
            
                1.69
             | 
            
                1.67
             |                     
            
                1.57
             |                                 
            
                77,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/11/2019
             | 
            
                -0.02 / -1.20%
             |             
            
                1.62
             |           
            
                1.69
             |               
            
                1.62
             |                           
            
                1.65
             | 
            
                1.67
             |                     
            
                1.54
             |                                 
            
                20,900
             |            
            
                 
             |                                       
         
    
        
            | 
                3/8/2019
             | 
            
                -0.03 / -1.76%
             |             
            
                1.73
             |           
            
                1.73
             |               
            
                1.65
             |                           
            
                1.67
             | 
            
                1.68
             |                     
            
                1.55
             |                                 
            
                45,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/7/2019
             | 
            
                +0.05 / +3.03%
             |             
            
                1.68
             |           
            
                1.73
             |               
            
                1.65
             |                           
            
                1.70
             | 
            
                1.71
             |                     
            
                1.58
             |                                 
            
                200,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/6/2019
             | 
            
                -0.04 / -2.37%
             |             
            
                1.66
             |           
            
                1.69
             |               
            
                1.65
             |                           
            
                1.65
             | 
            
                1.66
             |                     
            
                1.54
             |                                 
            
                74,320
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/5/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.69
             |           
            
                1.72
             |               
            
                1.61
             |                           
            
                1.69
             | 
            
                1.68
             |                     
            
                1.57
             |                                 
            
                113,900
             |            
            
                 
             |                                       
         
    
        
            | 
                3/4/2019
             | 
            
                +0.03 / +1.81%
             |             
            
                1.66
             |           
            
                1.70
             |               
            
                1.65
             |                           
            
                1.69
             | 
            
                1.68
             |                     
            
                1.57
             |                                 
            
                24,290
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/1/2019
             | 
            
                -0.01 / -0.60%
             |             
            
                1.70
             |           
            
                1.70
             |               
            
                1.60
             |                           
            
                1.66
             | 
            
                1.61
             |                     
            
                1.55
             |                                 
            
                112,140
             |            
            
                 
             |                                       
         
    
        
            | 
                2/28/2019
             | 
            
                -0.01 / -0.60%
             |             
            
                1.63
             |           
            
                1.71
             |               
            
                1.63
             |                           
            
                1.67
             | 
            
                1.66
             |                     
            
                1.55
             |                                 
            
                49,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/27/2019
             | 
            
                -0.01 / -0.59%
             |             
            
                1.68
             |           
            
                1.72
             |               
            
                1.66
             |                           
            
                1.68
             | 
            
                1.67
             |                     
            
                1.56
             |                                 
            
                52,040
             |            
            
                 
             |                                       
         
    
        
            | 
                2/26/2019
             | 
            
                -0.06 / -3.43%
             |             
            
                1.75
             |           
            
                1.75
             |               
            
                1.68
             |                           
            
                1.69
             | 
            
                1.69
             |                     
            
                1.57
             |                                 
            
                38,540
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/25/2019
             | 
            
                +0.06 / +3.55%
             |             
            
                1.71
             |           
            
                1.75
             |               
            
                1.68
             |                           
            
                1.75
             | 
            
                1.68
             |                     
            
                1.63
             |                                 
            
                583,570
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.69
             |           
            
                1.71
             |               
            
                1.60
             |                           
            
                1.69
             | 
            
                1.69
             |                     
            
                1.57
             |                                 
            
                29,610
             |  
            
                 
             |                                                              
             
    
         
    
    
 |