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                    Closing price on 6/3/2011
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        |           
                
                    | Open | 7.80 |  
                    | High | 7.80 |  
                    | Low | 7.10 |  
                    | Volume | 63,700 |  
                    | Split-adjusted Price | 7.30 |  
                
             | 
 |  V15 Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 6/3/2011 | 0.00 / 0.00% | 7.80 | 7.80 | 7.10 | 7.30 | 7.30 | 7.30 | 63,700 |   |  
            | 6/2/2011 | +0.30 / +4.29% | 7.00 | 7.30 | 7.00 | 7.30 | 7.30 | 7.30 | 31,400 |   |  			
            | 6/1/2011 | +0.20 / +2.94% | 6.60 | 7.00 | 6.30 | 7.00 | 7.00 | 7.00 | 50,900 |   |  
            | 5/31/2011 | +0.30 / +4.62% | 6.50 | 6.80 | 6.40 | 6.80 | 6.80 | 6.80 | 11,100 |   |  			
            | 5/30/2011 | -0.20 / -2.99% | 7.00 | 7.00 | 6.50 | 6.50 | 6.50 | 6.50 | 45,700 |   |  
            | 5/27/2011 | +0.20 / +3.08% | 6.70 | 6.70 | 6.20 | 6.70 | 6.50 | 6.70 | 72,700 |   |  			
            | 5/26/2011 | +0.10 / +1.56% | 6.10 | 6.80 | 6.10 | 6.50 | 6.50 | 6.50 | 50,100 |   |  
            | 5/25/2011 | -0.40 / -5.88% | 6.50 | 6.60 | 6.40 | 6.40 | 6.40 | 6.40 | 14,700 |   |  			
            | 5/24/2011 | -0.50 / -6.85% | 7.00 | 7.00 | 6.80 | 6.80 | 6.80 | 6.80 | 31,400 |   |  
            | 5/23/2011 | -0.50 / -6.41% | 7.50 | 7.50 | 7.30 | 7.30 | 7.30 | 7.30 | 48,000 |   |  			
            | 5/20/2011 | 0.00 / 0.00% | 8.10 | 8.10 | 7.60 | 7.80 | 7.80 | 7.80 | 6,600 |   |  
            | 5/19/2011 | -0.20 / -2.50% | 7.50 | 8.40 | 7.50 | 7.80 | 7.80 | 7.80 | 4,700 |   |  			
            | 5/18/2011 | -0.50 / -5.88% | 8.60 | 8.60 | 8.00 | 8.00 | 8.00 | 8.00 | 38,400 |   |  
            | 5/17/2011 | 0.00 / 0.00% | 9.00 | 9.00 | 8.50 | 8.50 | 8.50 | 8.50 | 6,500 |   |  			
            | 5/16/2011 | -0.60 / -6.59% | 9.00 | 9.10 | 8.50 | 8.50 | 8.50 | 8.50 | 19,700 |   |  
            | 5/13/2011 | -0.10 / -1.09% | 9.00 | 9.10 | 9.00 | 9.10 | 9.05 | 9.10 | 7,200 |   |  			
            | 5/12/2011 | +0.10 / +1.10% | 9.20 | 9.20 | 9.20 | 9.20 | 9.20 | 9.20 | 0 |   |  
            | 5/11/2011 | -0.20 / -2.15% | 9.50 | 9.50 | 9.10 | 9.10 | 9.10 | 9.10 | 5,600 |   |  			
            | 5/10/2011 | 0.00 / 0.00% | 9.30 | 9.40 | 9.20 | 9.30 | 9.30 | 9.30 | 13,700 |   |  
            | 5/9/2011 | +0.10 / +1.09% | 9.20 | 9.40 | 9.20 | 9.30 | 9.30 | 9.30 | 5,400 |   |  			
            | 5/6/2011 | +0.10 / +1.10% | 9.20 | 9.40 | 9.10 | 9.20 | 9.10 | 9.20 | 13,600 |   |  
            | 5/5/2011 | -0.10 / -1.09% | 9.50 | 9.50 | 9.10 | 9.10 | 9.10 | 9.10 | 12,700 |   |  			
            | 5/4/2011 | 0.00 / 0.00% | 9.50 | 9.50 | 9.20 | 9.20 | 9.20 | 9.20 | 21,600 |   |  
            | 4/29/2011 | -0.10 / -1.08% | 9.20 | 9.60 | 9.20 | 9.20 | 9.30 | 9.20 | 18,400 |   |  			
            | 4/28/2011 | -0.20 / -2.11% | 9.50 | 9.50 | 9.20 | 9.30 | 9.30 | 9.30 | 19,300 |   |  
            | 4/27/2011 | +0.20 / +2.15% | 9.50 | 9.50 | 9.10 | 9.50 | 9.50 | 9.50 | 23,900 |   |  			
            | 4/26/2011 | -0.50 / -5.10% | 9.70 | 9.70 | 9.20 | 9.30 | 9.30 | 9.30 | 50,000 |   |  
            | 4/25/2011 | +0.30 / +3.16% | 9.40 | 9.80 | 9.40 | 9.80 | 9.80 | 9.80 | 50,400 |   |  			
            | 4/22/2011 | 0.00 / 0.00% | 9.60 | 9.60 | 9.00 | 9.50 | 9.50 | 9.50 | 19,900 |   |  
            | 4/21/2011 | 0.00 / 0.00% | 9.50 | 9.60 | 9.40 | 9.50 | 9.50 | 9.50 | 19,900 |   |  |