| 
                 
                    Closing price on 11/13/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    1.72 | 
                 
                
                    | High | 
                    1.76 | 
                 
                
                    | Low | 
                    1.72 | 
                     
                
                    | Volume | 
                    44,760 | 
                                 
                
                    | Split-adjusted Price | 
                    1.62 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VOS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                11/13/2019
             | 
            
                -0.03 / -1.69%
             |             
            
                1.72
             |           
            
                1.76
             |               
            
                1.72
             |                           
            
                1.74
             | 
            
                1.74
             |                     
            
                1.62
             |                                 
            
                44,760
             |            
            
                 
             |                                       
         
    
        
            | 
                11/12/2019
             | 
            
                +0.04 / +2.31%
             |             
            
                1.73
             |           
            
                1.77
             |               
            
                1.73
             |                           
            
                1.77
             | 
            
                1.75
             |                     
            
                1.65
             |                                 
            
                14,490
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/11/2019
             | 
            
                +0.03 / +1.76%
             |             
            
                1.70
             |           
            
                1.75
             |               
            
                1.69
             |                           
            
                1.73
             | 
            
                1.69
             |                     
            
                1.61
             |                                 
            
                7,680
             |            
            
                 
             |                                       
         
    
        
            | 
                11/8/2019
             | 
            
                -0.01 / -0.58%
             |             
            
                1.72
             |           
            
                1.75
             |               
            
                1.70
             |                           
            
                1.70
             | 
            
                1.73
             |                     
            
                1.58
             |                                 
            
                35,290
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/7/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.75
             |           
            
                1.75
             |               
            
                1.70
             |                           
            
                1.71
             | 
            
                1.73
             |                     
            
                1.59
             |                                 
            
                17,080
             |            
            
                 
             |                                       
         
    
        
            | 
                11/6/2019
             | 
            
                -0.04 / -2.29%
             |             
            
                1.75
             |           
            
                1.77
             |               
            
                1.71
             |                           
            
                1.71
             | 
            
                1.76
             |                     
            
                1.59
             |                                 
            
                13,660
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/5/2019
             | 
            
                +0.05 / +2.94%
             |             
            
                1.70
             |           
            
                1.75
             |               
            
                1.68
             |                           
            
                1.75
             | 
            
                1.71
             |                     
            
                1.63
             |                                 
            
                20,460
             |            
            
                 
             |                                       
         
    
        
            | 
                11/4/2019
             | 
            
                -0.06 / -3.41%
             |             
            
                1.75
             |           
            
                1.80
             |               
            
                1.70
             |                           
            
                1.70
             | 
            
                1.73
             |                     
            
                1.58
             |                                 
            
                292,620
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/1/2019
             | 
            
                -0.01 / -0.56%
             |             
            
                1.77
             |           
            
                1.77
             |               
            
                1.70
             |                           
            
                1.76
             | 
            
                1.70
             |                     
            
                1.64
             |                                 
            
                78,020
             |            
            
                 
             |                                       
         
    
        
            | 
                10/31/2019
             | 
            
                +0.02 / +1.14%
             |             
            
                1.71
             |           
            
                1.77
             |               
            
                1.71
             |                           
            
                1.77
             | 
            
                1.73
             |                     
            
                1.65
             |                                 
            
                39,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/30/2019
             | 
            
                -0.01 / -0.57%
             |             
            
                1.72
             |           
            
                1.85
             |               
            
                1.71
             |                           
            
                1.75
             | 
            
                1.76
             |                     
            
                1.63
             |                                 
            
                12,520
             |            
            
                 
             |                                       
         
    
        
            | 
                10/29/2019
             | 
            
                +0.04 / +2.33%
             |             
            
                1.80
             |           
            
                1.80
             |               
            
                1.72
             |                           
            
                1.76
             | 
            
                1.74
             |                     
            
                1.64
             |                                 
            
                105,870
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/28/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.84
             |           
            
                1.84
             |               
            
                1.72
             |                           
            
                1.72
             | 
            
                1.73
             |                     
            
                1.60
             |                                 
            
                22,510
             |            
            
                 
             |                                       
         
    
        
            | 
                10/25/2019
             | 
            
                -0.03 / -1.71%
             |             
            
                1.71
             |           
            
                1.79
             |               
            
                1.71
             |                           
            
                1.72
             | 
            
                1.73
             |                     
            
                1.60
             |                                 
            
                79,720
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/24/2019
             | 
            
                -0.05 / -2.78%
             |             
            
                1.76
             |           
            
                1.80
             |               
            
                1.70
             |                           
            
                1.75
             | 
            
                1.79
             |                     
            
                1.63
             |                                 
            
                68,040
             |            
            
                 
             |                                       
         
    
        
            | 
                10/23/2019
             | 
            
                -0.05 / -2.70%
             |             
            
                1.85
             |           
            
                1.92
             |               
            
                1.80
             |                           
            
                1.80
             | 
            
                1.84
             |                     
            
                1.68
             |                                 
            
                5,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/22/2019
             | 
            
                +0.11 / +6.32%
             |             
            
                1.82
             |           
            
                1.86
             |               
            
                1.81
             |                           
            
                1.85
             | 
            
                1.84
             |                     
            
                1.72
             |                                 
            
                154,480
             |            
            
                 
             |                                       
         
    
        
            | 
                10/21/2019
             | 
            
                +0.11 / +6.75%
             |             
            
                1.63
             |           
            
                1.74
             |               
            
                1.63
             |                           
            
                1.74
             | 
            
                1.73
             |                     
            
                1.62
             |                                 
            
                229,930
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/18/2019
             | 
            
                -0.07 / -4.12%
             |             
            
                1.70
             |           
            
                1.78
             |               
            
                1.63
             |                           
            
                1.63
             | 
            
                1.66
             |                     
            
                1.52
             |                                 
            
                83,770
             |            
            
                 
             |                                       
         
    
        
            | 
                10/17/2019
             | 
            
                -0.08 / -4.49%
             |             
            
                1.78
             |           
            
                1.79
             |               
            
                1.70
             |                           
            
                1.70
             | 
            
                1.71
             |                     
            
                1.58
             |                                 
            
                62,470
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/16/2019
             | 
            
                +0.03 / +1.71%
             |             
            
                1.80
             |           
            
                1.80
             |               
            
                1.77
             |                           
            
                1.78
             | 
            
                1.79
             |                     
            
                1.66
             |                                 
            
                56,270
             |            
            
                 
             |                                       
         
    
        
            | 
                10/15/2019
             | 
            
                -0.02 / -1.13%
             |             
            
                1.77
             |           
            
                1.80
             |               
            
                1.75
             |                           
            
                1.75
             | 
            
                1.77
             |                     
            
                1.63
             |                                 
            
                116,310
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/14/2019
             | 
            
                -0.03 / -1.67%
             |             
            
                1.80
             |           
            
                1.80
             |               
            
                1.75
             |                           
            
                1.77
             | 
            
                1.78
             |                     
            
                1.65
             |                                 
            
                15,180
             |            
            
                 
             |                                       
         
    
        
            | 
                10/11/2019
             | 
            
                +0.01 / +0.56%
             |             
            
                1.84
             |           
            
                1.84
             |               
            
                1.76
             |                           
            
                1.80
             | 
            
                1.79
             |                     
            
                1.68
             |                                 
            
                53,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/10/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.80
             |           
            
                1.84
             |               
            
                1.79
             |                           
            
                1.79
             | 
            
                1.81
             |                     
            
                1.67
             |                                 
            
                21,330
             |            
            
                 
             |                                       
         
    
        
            | 
                10/9/2019
             | 
            
                -0.03 / -1.65%
             |             
            
                1.80
             |           
            
                1.80
             |               
            
                1.75
             |                           
            
                1.79
             | 
            
                1.77
             |                     
            
                1.67
             |                                 
            
                32,120
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/8/2019
             | 
            
                +0.03 / +1.68%
             |             
            
                1.80
             |           
            
                1.82
             |               
            
                1.70
             |                           
            
                1.82
             | 
            
                1.74
             |                     
            
                1.69
             |                                 
            
                33,280
             |            
            
                 
             |                                       
         
    
        
            | 
                10/7/2019
             | 
            
                -0.06 / -3.24%
             |             
            
                1.89
             |           
            
                1.89
             |               
            
                1.79
             |                           
            
                1.79
             | 
            
                1.80
             |                     
            
                1.67
             |                                 
            
                99,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/4/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.85
             |           
            
                1.86
             |               
            
                1.84
             |                           
            
                1.85
             | 
            
                1.84
             |                     
            
                1.72
             |                                 
            
                30,930
             |            
            
                 
             |                                       
         
    
        
            | 
                10/3/2019
             | 
            
                -0.05 / -2.63%
             |             
            
                1.93
             |           
            
                1.93
             |               
            
                1.85
             |                           
            
                1.85
             | 
            
                1.89
             |                     
            
                1.72
             |                                 
            
                21,160
             |  
            
                 
             |                                                              
             
    
         
    
    
 |