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                    Closing price on 8/31/2012
                 |  |  
    
        |           
                
                    | Open | 4.50 |  
                    | High | 4.50 |  
                    | Low | 4.30 |  
                    | Volume | 62,300 |  
                    | Split-adjusted Price | 4.50 |  
                
             | 
 |  PSI Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 8/31/2012 | 0.00 / 0.00% | 4.50 | 4.50 | 4.30 | 4.50 | 4.50 | 4.50 | 62,300 |   |  
            | 8/30/2012 | -0.10 / -2.17% | 4.40 | 4.60 | 4.30 | 4.50 | 4.50 | 4.50 | 116,100 |   |  			
            | 8/29/2012 | +0.20 / +4.55% | 4.40 | 4.60 | 4.20 | 4.60 | 4.60 | 4.60 | 10,600 |   |  
            | 8/28/2012 | -0.10 / -2.22% | 4.30 | 4.50 | 4.20 | 4.40 | 4.40 | 4.40 | 61,900 |   |  			
            | 8/27/2012 | -0.20 / -4.26% | 4.40 | 4.50 | 4.30 | 4.50 | 4.50 | 4.50 | 99,900 |   |  
            | 8/24/2012 | +0.30 / +6.82% | 4.20 | 4.70 | 4.10 | 4.70 | 4.70 | 4.70 | 62,100 |   |  			
            | 8/23/2012 | -0.40 / -8.33% | 4.50 | 4.50 | 4.40 | 4.40 | 4.40 | 4.40 | 154,400 |   |  
            | 8/22/2012 | +0.10 / +2.13% | 4.60 | 4.80 | 4.60 | 4.80 | 4.80 | 4.80 | 173,000 |   |  			
            | 8/21/2012 | -0.50 / -9.62% | 5.00 | 5.00 | 4.70 | 4.70 | 4.70 | 4.70 | 280,300 |   |  
            | 8/20/2012 | +0.10 / +1.96% | 4.80 | 5.20 | 4.80 | 5.20 | 5.20 | 5.20 | 37,700 |   |  			
            | 8/17/2012 | 0.00 / 0.00% | 5.00 | 5.10 | 5.00 | 5.10 | 5.10 | 5.10 | 30,490 |   |  
            | 8/16/2012 | 0.00 / 0.00% | 5.10 | 5.10 | 5.10 | 5.10 | 5.10 | 5.10 | 18,900 |   |  			
            | 8/15/2012 | -0.10 / -1.92% | 5.20 | 5.20 | 5.10 | 5.10 | 5.10 | 5.10 | 11,300 |   |  
            | 8/14/2012 | +0.10 / +1.96% | 5.10 | 5.20 | 5.00 | 5.20 | 5.20 | 5.20 | 9,700 |   |  			
            | 8/13/2012 | -0.10 / -1.92% | 5.30 | 5.30 | 5.10 | 5.10 | 5.10 | 5.10 | 400 |   |  
            | 8/10/2012 | -0.10 / -1.89% | 5.20 | 5.30 | 5.10 | 5.20 | 5.20 | 5.20 | 37,300 |   |  			
            | 8/9/2012 | +0.10 / +1.92% | 5.10 | 5.30 | 5.10 | 5.30 | 5.30 | 5.30 | 90,300 |   |  
            | 8/8/2012 | +0.10 / +1.96% | 5.10 | 5.20 | 5.00 | 5.20 | 5.20 | 5.20 | 23,800 |   |  			
            | 8/7/2012 | 0.00 / 0.00% | 5.10 | 5.10 | 5.00 | 5.10 | 5.10 | 5.10 | 45,400 |   |  
            | 8/6/2012 | +0.10 / +2.00% | 5.10 | 5.30 | 5.10 | 5.10 | 5.10 | 5.10 | 86,100 |   |  			
            | 8/3/2012 | 0.00 / 0.00% | 5.00 | 5.10 | 4.90 | 5.00 | 5.00 | 5.00 | 84,600 |   |  
            | 8/2/2012 | +0.10 / +2.04% | 5.00 | 5.00 | 4.90 | 5.00 | 5.00 | 5.00 | 123,000 |   |  			
            | 8/1/2012 | -0.10 / -2.00% | 4.80 | 4.90 | 4.80 | 4.90 | 4.90 | 4.90 | 40,700 |   |  
            | 7/31/2012 | +0.20 / +4.17% | 4.90 | 5.00 | 4.90 | 5.00 | 5.00 | 5.00 | 67,500 |   |  			
            | 7/30/2012 | -0.10 / -2.04% | 4.80 | 5.00 | 4.80 | 4.80 | 4.80 | 4.80 | 25,000 |   |  
            | 7/27/2012 | -0.10 / -2.00% | 4.90 | 5.00 | 4.90 | 4.90 | 4.90 | 4.90 | 36,300 |   |  			
            | 7/26/2012 | +0.10 / +2.04% | 4.90 | 5.00 | 4.90 | 5.00 | 5.00 | 5.00 | 16,900 |   |  
            | 7/25/2012 | +0.10 / +2.08% | 4.80 | 4.90 | 4.70 | 4.90 | 4.90 | 4.90 | 112,400 |   |  			
            | 7/24/2012 | -0.30 / -5.88% | 4.90 | 4.90 | 4.80 | 4.80 | 4.80 | 4.80 | 79,000 |   |  
            | 7/23/2012 | -0.20 / -3.77% | 5.10 | 5.20 | 5.00 | 5.10 | 5.10 | 5.10 | 184,100 |   |  |