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            | 
                    Closing price on 4/23/2015
                 |  |  
    
        |           
                
                    | Open | 4.60 |  
                    | High | 4.60 |  
                    | Low | 4.30 |  
                    | Volume | 202,030 |  
                    | Split-adjusted Price | 4.28 |  
                
             | 
 |  VOS Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 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 |   |  
            | 4/6/2015 | -0.30 / -6.25% | 4.80 | 4.90 | 4.50 | 4.50 | 4.59 | 4.19 | 432,470 |   |  			
            | 4/3/2015 | -0.20 / -4.00% | 5.00 | 5.00 | 4.80 | 4.80 | 4.84 | 4.47 | 183,170 |   |  
            | 4/2/2015 | 0.00 / 0.00% | 4.90 | 5.00 | 4.70 | 5.00 | 4.81 | 4.65 | 338,770 |   |  			
            | 4/1/2015 | -0.30 / -5.66% | 5.30 | 5.30 | 5.00 | 5.00 | 5.03 | 4.65 | 385,660 |   |  
            | 3/31/2015 | 0.00 / 0.00% | 5.30 | 5.40 | 5.30 | 5.30 | 5.30 | 4.93 | 168,440 |   |  			
            | 3/30/2015 | -0.30 / -5.36% | 5.50 | 5.50 | 5.30 | 5.30 | 5.35 | 4.93 | 516,840 |   |  
            | 3/27/2015 | +0.10 / +1.82% | 5.60 | 5.60 | 5.50 | 5.60 | 5.55 | 5.21 | 189,250 |   |  			
            | 3/26/2015 | 0.00 / 0.00% | 5.40 | 5.60 | 5.40 | 5.50 | 5.54 | 5.12 | 248,320 |   |  
            | 3/25/2015 | -0.10 / -1.79% | 5.60 | 5.70 | 5.50 | 5.50 | 5.58 | 5.12 | 274,310 |   |  			
            | 3/24/2015 | -0.30 / -5.08% | 5.90 | 5.90 | 5.50 | 5.60 | 5.56 | 5.21 | 1,553,910 |   |  
            | 3/23/2015 | -0.20 / -3.28% | 6.00 | 6.10 | 5.80 | 5.90 | 5.91 | 5.49 | 480,980 |   |  			
            | 3/20/2015 | 0.00 / 0.00% | 6.00 | 6.10 | 6.00 | 6.10 | 6.02 | 5.68 | 571,390 |   |  
            | 3/19/2015 | -0.10 / -1.61% | 6.10 | 6.20 | 6.00 | 6.10 | 6.10 | 5.68 | 113,170 |   |  			
            | 3/18/2015 | +0.10 / +1.64% | 6.10 | 6.20 | 6.00 | 6.20 | 6.20 | 5.77 | 219,070 |   |  
            | 3/17/2015 | -0.10 / -1.61% | 6.20 | 6.20 | 6.10 | 6.10 | 6.10 | 5.68 | 171,080 |   |  			
            | 3/16/2015 | 0.00 / 0.00% | 6.20 | 6.20 | 6.10 | 6.20 | 6.20 | 5.77 | 220,540 |   |  
            | 3/13/2015 | 0.00 / 0.00% | 6.20 | 6.30 | 6.20 | 6.20 | 6.20 | 5.77 | 138,200 |   |  |