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                    Closing price on 7/5/2012
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        |           
                
                    | Open | 4.20 |  
                    | High | 4.70 |  
                    | Low | 4.20 |  
                    | Volume | 127,300 |  
                    | Split-adjusted Price | 4.70 |  
                
             | 
 |  PSI Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 7/5/2012 | +0.30 / +6.82% | 4.20 | 4.70 | 4.20 | 4.70 | 4.70 | 4.70 | 127,300 |   |  
            | 7/4/2012 | -0.30 / -6.38% | 4.80 | 4.80 | 4.40 | 4.40 | 4.40 | 4.40 | 97,100 |   |  			
            | 7/3/2012 | -0.40 / -7.84% | 4.70 | 5.00 | 4.60 | 4.70 | 4.70 | 4.70 | 86,525 |   |  
            | 7/2/2012 | 0.00 / 0.00% | 5.10 | 5.20 | 4.90 | 5.10 | 5.10 | 5.10 | 80,100 |   |  			
            | 6/29/2012 | -0.20 / -3.77% | 5.20 | 5.20 | 5.00 | 5.10 | 5.10 | 5.10 | 51,800 |   |  
            | 6/28/2012 | +0.30 / +6.00% | 4.70 | 5.30 | 4.70 | 5.30 | 5.30 | 5.30 | 195,400 |   |  			
            | 6/27/2012 | -0.10 / -1.96% | 5.10 | 5.20 | 5.00 | 5.00 | 5.00 | 5.00 | 65,800 |   |  
            | 6/26/2012 | 0.00 / 0.00% | 5.20 | 5.20 | 4.90 | 5.10 | 5.10 | 5.10 | 191,200 |   |  			
            | 6/25/2012 | -0.30 / -5.56% | 5.40 | 5.40 | 5.10 | 5.10 | 5.10 | 5.10 | 126,200 |   |  
            | 6/22/2012 | -0.10 / -1.82% | 5.40 | 5.40 | 5.30 | 5.40 | 5.40 | 5.40 | 106,900 |   |  			
            | 6/21/2012 | +0.10 / +1.85% | 5.30 | 5.50 | 5.30 | 5.50 | 5.50 | 5.50 | 53,600 |   |  
            | 6/20/2012 | 0.00 / 0.00% | 5.40 | 5.50 | 5.30 | 5.40 | 5.40 | 5.40 | 53,700 |   |  			
            | 6/19/2012 | -0.20 / -3.57% | 5.50 | 5.50 | 5.30 | 5.40 | 5.40 | 5.40 | 191,000 |   |  
            | 6/18/2012 | 0.00 / 0.00% | 5.70 | 5.70 | 5.50 | 5.60 | 5.60 | 5.60 | 185,900 |   |  			
            | 6/15/2012 | +0.40 / +7.69% | 5.30 | 5.60 | 5.30 | 5.60 | 5.60 | 5.60 | 127,500 |   |  
            | 6/14/2012 | -0.20 / -3.70% | 5.30 | 5.40 | 5.20 | 5.20 | 5.20 | 5.20 | 119,700 |   |  			
            | 6/13/2012 | 0.00 / 0.00% | 5.50 | 5.50 | 5.30 | 5.40 | 5.40 | 5.40 | 107,000 |   |  
            | 6/12/2012 | -0.40 / -6.90% | 5.60 | 5.60 | 5.40 | 5.40 | 5.40 | 5.40 | 141,900 |   |  			
            | 6/11/2012 | +0.20 / +3.57% | 5.60 | 5.80 | 5.50 | 5.80 | 5.80 | 5.80 | 95,600 |   |  
            | 6/8/2012 | 0.00 / 0.00% | 5.80 | 5.80 | 5.60 | 5.60 | 5.60 | 5.60 | 233,100 |   |  			
            | 6/7/2012 | +0.30 / +5.66% | 5.40 | 5.60 | 5.40 | 5.60 | 5.60 | 5.60 | 345,700 |   |  
            | 6/6/2012 | 0.00 / 0.00% | 5.30 | 5.50 | 5.30 | 5.30 | 5.30 | 5.30 | 209,900 |   |  			
            | 6/5/2012 | +0.10 / +1.92% | 5.20 | 5.40 | 5.10 | 5.30 | 5.30 | 5.30 | 172,000 |   |  
            | 6/4/2012 | -0.30 / -5.45% | 5.40 | 5.40 | 5.20 | 5.20 | 5.20 | 5.20 | 367,300 |   |  			
            | 6/1/2012 | +0.10 / +1.85% | 5.50 | 5.60 | 5.30 | 5.50 | 5.50 | 5.50 | 166,900 |   |  
            | 5/31/2012 | -0.30 / -5.26% | 5.70 | 5.70 | 5.40 | 5.40 | 5.40 | 5.40 | 134,700 |   |  			
            | 5/30/2012 | +0.20 / +3.64% | 5.60 | 5.80 | 5.60 | 5.70 | 5.70 | 5.70 | 258,600 |   |  
            | 5/29/2012 | -0.10 / -1.79% | 5.60 | 5.60 | 5.40 | 5.50 | 5.50 | 5.50 | 112,800 |   |  			
            | 5/28/2012 | 0.00 / 0.00% | 5.80 | 5.80 | 5.60 | 5.60 | 5.60 | 5.60 | 183,300 |   |  
            | 5/25/2012 | +0.20 / +3.70% | 5.50 | 5.60 | 5.40 | 5.60 | 5.60 | 5.60 | 186,300 |   |  |