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                    Closing price on 5/22/2015
                 |  |  
    
        |           
                
                    | Open | 3.90 |  
                    | High | 4.00 |  
                    | Low | 3.90 |  
                    | Volume | 87,930 |  
                    | Split-adjusted Price | 3.72 |  
                
             | 
 |  VOS Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/22/2015 | +0.10 / +2.56% | 3.90 | 4.00 | 3.90 | 4.00 | 3.91 | 3.72 | 87,930 |   |  
            | 5/21/2015 | 0.00 / 0.00% | 3.90 | 4.00 | 3.90 | 3.90 | 3.93 | 3.63 | 58,520 |   |  			
            | 5/20/2015 | +0.20 / +5.41% | 3.60 | 3.90 | 3.60 | 3.90 | 3.79 | 3.63 | 104,350 |   |  
            | 5/19/2015 | 0.00 / 0.00% | 3.80 | 3.80 | 3.70 | 3.70 | 3.73 | 3.44 | 90,450 |   |  			
            | 5/18/2015 | -0.20 / -5.13% | 3.70 | 3.80 | 3.70 | 3.70 | 3.70 | 3.44 | 240,720 |   |  
            | 5/15/2015 | -0.20 / -4.88% | 3.90 | 4.00 | 3.90 | 3.90 | 3.93 | 3.63 | 234,420 |   |  			
            | 5/14/2015 | +0.20 / +5.13% | 4.00 | 4.10 | 3.90 | 4.10 | 3.99 | 3.82 | 110,200 |   |  
            | 5/13/2015 | -0.20 / -4.88% | 4.00 | 4.00 | 3.90 | 3.90 | 3.99 | 3.63 | 51,340 |   |  			
            | 5/12/2015 | 0.00 / 0.00% | 4.00 | 4.10 | 3.90 | 4.10 | 4.02 | 3.82 | 41,280 |   |  
            | 5/11/2015 | +0.20 / +5.13% | 3.90 | 4.10 | 3.90 | 4.10 | 4.07 | 3.82 | 153,030 |   |  			
            | 5/8/2015 | +0.10 / +2.63% | 3.70 | 4.00 | 3.70 | 3.90 | 3.81 | 3.63 | 131,020 |   |  
            | 5/7/2015 | -0.10 / -2.56% | 3.90 | 3.90 | 3.80 | 3.80 | 3.82 | 3.54 | 90,000 |   |  			
            | 5/6/2015 | -0.10 / -2.50% | 4.00 | 4.00 | 3.80 | 3.90 | 3.85 | 3.63 | 403,350 |   |  
            | 5/5/2015 | -0.20 / -4.76% | 4.00 | 4.20 | 4.00 | 4.00 | 4.04 | 3.72 | 265,370 |   |  			
            | 5/4/2015 | -0.30 / -6.67% | 4.30 | 4.30 | 4.20 | 4.20 | 4.22 | 3.91 | 282,540 |   |  
            | 4/27/2015 | 0.00 / 0.00% | 4.50 | 4.50 | 4.30 | 4.50 | 4.40 | 4.19 | 137,200 |   |  			
            | 4/24/2015 | -0.10 / -2.17% | 4.60 | 4.60 | 4.40 | 4.50 | 4.55 | 4.19 | 110,390 |   |  
            | 4/23/2015 | +0.10 / +2.22% | 4.60 | 4.60 | 4.30 | 4.60 | 4.44 | 4.28 | 202,030 |   |  			
            | 4/22/2015 | -0.20 / -4.26% | 4.50 | 4.70 | 4.50 | 4.50 | 4.50 | 4.19 | 236,700 |   |  
            | 4/21/2015 | 0.00 / 0.00% | 4.70 | 4.80 | 4.60 | 4.70 | 4.67 | 4.37 | 107,140 |   |  			
            | 4/20/2015 | -0.20 / -4.08% | 4.80 | 4.80 | 4.70 | 4.70 | 4.73 | 4.37 | 112,960 |   |  
            | 4/17/2015 | 0.00 / 0.00% | 4.90 | 5.00 | 4.80 | 4.90 | 4.82 | 4.56 | 242,530 |   |  			
            | 4/16/2015 | 0.00 / 0.00% | 5.00 | 5.00 | 4.90 | 4.90 | 4.98 | 4.56 | 149,920 |   |  
            | 4/15/2015 | +0.10 / +2.08% | 4.90 | 5.00 | 4.80 | 4.90 | 4.91 | 4.56 | 314,910 |   |  			
            | 4/14/2015 | -0.20 / -4.00% | 5.00 | 5.00 | 4.80 | 4.80 | 4.91 | 4.47 | 264,730 |   |  
            | 4/13/2015 | +0.10 / +2.04% | 4.80 | 5.00 | 4.80 | 5.00 | 4.95 | 4.65 | 247,310 |   |  			
            | 4/10/2015 | +0.10 / +2.08% | 4.80 | 4.90 | 4.70 | 4.90 | 4.81 | 4.56 | 234,730 |   |  
            | 4/9/2015 | +0.20 / +4.35% | 4.60 | 4.80 | 4.50 | 4.80 | 4.66 | 4.47 | 244,500 |   |  			
            | 4/8/2015 | -0.10 / -2.13% | 4.70 | 4.80 | 4.50 | 4.60 | 4.61 | 4.28 | 45,980 |   |  
            | 4/7/2015 | +0.20 / +4.44% | 4.40 | 4.70 | 4.30 | 4.70 | 4.45 | 4.37 | 491,060 |   |  |