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            | 
                    Closing price on 3/4/2013
                 |  |  
    
        |           
                
                    | Open | 4.20 |  
                    | High | 4.20 |  
                    | Low | 4.00 |  
                    | Volume | 18,100 |  
                    | Split-adjusted Price | 4.20 |  
                
             | 
 |  PSI Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 3/4/2013 | -0.20 / -4.55% | 4.20 | 4.20 | 4.00 | 4.20 | 4.20 | 4.20 | 18,100 |   |  
            | 3/1/2013 | 0.00 / 0.00% | 4.40 | 4.40 | 4.30 | 4.40 | 4.40 | 4.40 | 13,300 |   |  			
            | 2/28/2013 | +0.10 / +2.33% | 4.40 | 4.40 | 4.20 | 4.40 | 4.40 | 4.40 | 37,300 |   |  
            | 2/27/2013 | 0.00 / 0.00% | 4.20 | 4.30 | 4.20 | 4.30 | 4.30 | 4.30 | 15,300 |   |  			
            | 2/26/2013 | -0.20 / -4.44% | 4.40 | 4.50 | 4.10 | 4.30 | 4.30 | 4.30 | 112,700 |   |  
            | 2/25/2013 | +0.10 / +2.27% | 4.40 | 4.60 | 4.30 | 4.50 | 4.50 | 4.50 | 11,700 |   |  			
            | 2/22/2013 | -0.10 / -2.22% | 4.40 | 4.50 | 4.20 | 4.40 | 4.40 | 4.40 | 135,390 |   |  
            | 2/21/2013 | -0.40 / -8.16% | 4.80 | 4.90 | 4.50 | 4.50 | 4.50 | 4.50 | 177,700 |   |  			
            | 2/20/2013 | +0.20 / +4.26% | 4.70 | 4.90 | 4.70 | 4.90 | 4.90 | 4.90 | 63,500 |   |  
            | 2/19/2013 | -0.20 / -4.08% | 4.70 | 4.80 | 4.60 | 4.70 | 4.70 | 4.70 | 100,700 |   |  			
            | 2/18/2013 | +0.40 / +8.89% | 4.60 | 4.90 | 4.50 | 4.90 | 4.90 | 4.90 | 144,500 |   |  
            | 2/8/2013 | +0.20 / +4.65% | 4.20 | 4.60 | 4.20 | 4.50 | 4.50 | 4.50 | 81,200 |   |  			
            | 2/7/2013 | +0.10 / +2.38% | 4.10 | 4.50 | 4.00 | 4.30 | 4.30 | 4.30 | 70,700 |   |  
            | 2/6/2013 | +0.30 / +7.69% | 4.00 | 4.20 | 4.00 | 4.20 | 4.20 | 4.20 | 46,600 |   |  			
            | 2/5/2013 | -0.10 / -2.50% | 4.00 | 4.00 | 3.90 | 3.90 | 3.90 | 3.90 | 52,000 |   |  
            | 2/4/2013 | 0.00 / 0.00% | 4.00 | 4.00 | 3.90 | 4.00 | 4.00 | 4.00 | 12,800 |   |  			
            | 2/1/2013 | -0.10 / -2.44% | 4.00 | 4.00 | 3.90 | 4.00 | 4.00 | 4.00 | 39,200 |   |  
            | 1/31/2013 | +0.10 / +2.50% | 4.00 | 4.10 | 3.90 | 4.10 | 4.10 | 4.10 | 74,800 |   |  			
            | 1/30/2013 | -0.10 / -2.44% | 4.20 | 4.20 | 4.00 | 4.00 | 4.00 | 4.00 | 41,000 |   |  
            | 1/29/2013 | 0.00 / 0.00% | 4.10 | 4.20 | 3.90 | 4.10 | 4.10 | 4.10 | 62,025 |   |  			
            | 1/28/2013 | 0.00 / 0.00% | 4.10 | 4.30 | 4.10 | 4.10 | 4.10 | 4.10 | 73,800 |   |  
            | 1/25/2013 | 0.00 / 0.00% | 4.20 | 4.20 | 4.00 | 4.10 | 4.10 | 4.10 | 48,025 |   |  			
            | 1/24/2013 | +0.20 / +5.13% | 4.00 | 4.10 | 3.80 | 4.10 | 4.10 | 4.10 | 169,300 |   |  
            | 1/23/2013 | +0.10 / +2.63% | 4.00 | 4.00 | 3.70 | 3.90 | 3.90 | 3.90 | 45,300 |   |  			
            | 1/22/2013 | -0.20 / -5.00% | 4.00 | 4.00 | 3.80 | 3.80 | 3.80 | 3.80 | 41,080 |   |  
            | 1/21/2013 | +0.10 / +2.56% | 4.10 | 4.10 | 4.00 | 4.00 | 4.00 | 4.00 | 83,600 |   |  			
            | 1/18/2013 | -0.50 / -11.36% | 4.40 | 4.40 | 3.90 | 3.90 | 3.90 | 3.90 | 242,690 |   |  
            | 1/17/2013 | -0.40 / -8.33% | 4.70 | 4.70 | 4.30 | 4.40 | 4.40 | 4.40 | 95,200 |   |  			
            | 1/16/2013 | +0.20 / +4.35% | 4.70 | 4.80 | 4.50 | 4.80 | 4.80 | 4.80 | 59,300 |   |  
            | 1/15/2013 | +0.20 / +4.55% | 4.00 | 4.60 | 4.00 | 4.60 | 4.60 | 4.60 | 356,700 |   |  |