| 
                 
                    Closing price on 10/7/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    12.50 | 
                 
                
                    | High | 
                    12.90 | 
                 
                
                    | Low | 
                    11.80 | 
                     
                
                    | Volume | 
                    22,800 | 
                                 
                
                    | Split-adjusted Price | 
                    7.40 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
POT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                10/7/2011
             | 
            
                -0.50 / -4.07%
             |             
            
                12.50
             |           
            
                12.90
             |               
            
                11.80
             |                           
            
                11.80
             | 
            
                11.99
             |                     
            
                7.40
             |                                 
            
                22,800
             |            
            
                 
             |                                       
         
    
        
            | 
                10/6/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.10
             |           
            
                12.80
             |               
            
                11.70
             |                           
            
                12.30
             | 
            
                12.06
             |                     
            
                7.72
             |                                 
            
                78,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/5/2011
             | 
            
                -0.40 / -3.15%
             |             
            
                13.30
             |           
            
                13.40
             |               
            
                12.20
             |                           
            
                12.30
             | 
            
                12.52
             |                     
            
                7.72
             |                                 
            
                59,800
             |            
            
                 
             |                                       
         
    
        
            | 
                10/4/2011
             | 
            
                +0.10 / +0.79%
             |             
            
                13.20
             |           
            
                13.20
             |               
            
                12.60
             |                           
            
                12.70
             | 
            
                13.04
             |                     
            
                7.97
             |                                 
            
                203,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/3/2011
             | 
            
                +0.70 / +5.88%
             |             
            
                12.00
             |           
            
                12.60
             |               
            
                11.90
             |                           
            
                12.60
             | 
            
                12.45
             |                     
            
                7.91
             |                                 
            
                92,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/30/2011
             | 
            
                -0.10 / -0.83%
             |             
            
                11.40
             |           
            
                12.10
             |               
            
                11.00
             |                           
            
                11.90
             | 
            
                11.78
             |                     
            
                7.47
             |                                 
            
                50,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/29/2011
             | 
            
                -0.20 / -1.64%
             |             
            
                12.30
             |           
            
                12.30
             |               
            
                11.40
             |                           
            
                12.00
             | 
            
                11.76
             |                     
            
                7.53
             |                                 
            
                62,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/28/2011
             | 
            
                +0.50 / +4.27%
             |             
            
                11.50
             |           
            
                12.20
             |               
            
                11.50
             |                           
            
                12.20
             | 
            
                11.84
             |                     
            
                7.66
             |                                 
            
                127,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/27/2011
             | 
            
                -0.30 / -2.50%
             |             
            
                12.20
             |           
            
                12.20
             |               
            
                11.70
             |                           
            
                11.70
             | 
            
                11.73
             |                     
            
                7.34
             |                                 
            
                106,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/26/2011
             | 
            
                -0.10 / -0.83%
             |             
            
                12.90
             |           
            
                12.90
             |               
            
                11.70
             |                           
            
                12.00
             | 
            
                12.52
             |                     
            
                7.53
             |                                 
            
                228,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/23/2011
             | 
            
                +0.70 / +6.14%
             |             
            
                12.10
             |           
            
                12.10
             |               
            
                11.70
             |                           
            
                12.10
             | 
            
                12.08
             |                     
            
                7.59
             |                                 
            
                377,300
             |            
            
                 
             |                                       
         
    
        
            | 
                9/22/2011
             | 
            
                +0.70 / +6.54%
             |             
            
                11.40
             |           
            
                11.40
             |               
            
                11.40
             |                           
            
                11.40
             | 
            
                11.40
             |                     
            
                7.15
             |                                 
            
                20,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/21/2011
             | 
            
                +0.70 / +7.00%
             |             
            
                10.70
             |           
            
                10.70
             |               
            
                10.70
             |                           
            
                10.70
             | 
            
                10.70
             |                     
            
                6.71
             |                                 
            
                33,600
             |            
            
                 
             |                                       
         
    
        
            | 
                9/20/2011
             | 
            
                +0.60 / +6.38%
             |             
            
                10.00
             |           
            
                10.00
             |               
            
                10.00
             |                           
            
                10.00
             | 
            
                10.00
             |                     
            
                6.27
             |                                 
            
                71,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/19/2011
             | 
            
                +0.50 / +5.62%
             |             
            
                9.40
             |           
            
                9.40
             |               
            
                9.40
             |                           
            
                9.40
             | 
            
                9.40
             |                     
            
                5.90
             |                                 
            
                91,700
             |            
            
                 
             |                                       
         
    
        
            | 
                9/16/2011
             | 
            
                +0.50 / +5.95%
             |             
            
                8.50
             |           
            
                8.90
             |               
            
                8.40
             |                           
            
                8.90
             | 
            
                8.84
             |                     
            
                5.58
             |                                 
            
                124,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/15/2011
             | 
            
                -0.20 / -2.33%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.30
             |                           
            
                8.40
             | 
            
                8.43
             |                     
            
                5.27
             |                                 
            
                22,500
             |            
            
                 
             |                                       
         
    
        
            | 
                9/14/2011
             | 
            
                0.00 / 0.00%
             |             
            
                8.80
             |           
            
                9.20
             |               
            
                8.60
             |                           
            
                8.60
             | 
            
                8.79
             |                     
            
                5.40
             |                                 
            
                54,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/13/2011
             | 
            
                +0.30 / +3.61%
             |             
            
                8.60
             |           
            
                8.60
             |               
            
                8.50
             |                           
            
                8.60
             | 
            
                8.60
             |                     
            
                5.40
             |                                 
            
                53,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/12/2011
             | 
            
                +0.10 / +1.22%
             |             
            
                8.40
             |           
            
                8.40
             |               
            
                7.80
             |                           
            
                8.30
             | 
            
                8.10
             |                     
            
                5.21
             |                                 
            
                38,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/9/2011
             | 
            
                +0.10 / +1.23%
             |             
            
                8.20
             |           
            
                8.20
             |               
            
                8.00
             |                           
            
                8.20
             | 
            
                8.08
             |                     
            
                5.15
             |                                 
            
                7,900
             |            
            
                 
             |                                       
         
    
        
            | 
                9/8/2011
             | 
            
                -0.20 / -2.41%
             |             
            
                8.20
             |           
            
                8.50
             |               
            
                8.10
             |                           
            
                8.10
             | 
            
                8.21
             |                     
            
                5.08
             |                                 
            
                30,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/7/2011
             | 
            
                +0.40 / +5.06%
             |             
            
                8.20
             |           
            
                8.30
             |               
            
                8.00
             |                           
            
                8.30
             | 
            
                8.21
             |                     
            
                5.21
             |                                 
            
                37,100
             |            
            
                 
             |                                       
         
    
        
            | 
                9/6/2011
             | 
            
                -0.10 / -1.25%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.80
             |                           
            
                7.90
             | 
            
                7.90
             |                     
            
                4.96
             |                                 
            
                4,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/5/2011
             | 
            
                0.00 / 0.00%
             |             
            
                7.90
             |           
            
                8.00
             |               
            
                7.80
             |                           
            
                8.00
             | 
            
                7.99
             |                     
            
                5.02
             |                                 
            
                13,000
             |            
            
                 
             |                                       
         
    
        
            | 
                9/1/2011
             | 
            
                +0.10 / +1.27%
             |             
            
                8.00
             |           
            
                8.00
             |               
            
                7.80
             |                           
            
                8.00
             | 
            
                7.93
             |                     
            
                5.02
             |                                 
            
                27,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/31/2011
             | 
            
                -0.10 / -1.25%
             |             
            
                8.00
             |           
            
                8.00
             |               
            
                7.70
             |                           
            
                7.90
             | 
            
                7.83
             |                     
            
                4.96
             |                                 
            
                13,700
             |            
            
                 
             |                                       
         
    
        
            | 
                8/30/2011
             | 
            
                -0.10 / -1.23%
             |             
            
                8.10
             |           
            
                8.20
             |               
            
                7.90
             |                           
            
                8.00
             | 
            
                7.99
             |                     
            
                5.02
             |                                 
            
                14,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/29/2011
             | 
            
                +0.20 / +2.53%
             |             
            
                8.10
             |           
            
                8.10
             |               
            
                8.00
             |                           
            
                8.10
             | 
            
                8.02
             |                     
            
                5.08
             |                                 
            
                9,400
             |            
            
                 
             |                                       
         
    
        
            | 
                8/26/2011
             | 
            
                -0.30 / -3.66%
             |             
            
                8.20
             |           
            
                8.20
             |               
            
                7.90
             |                           
            
                7.90
             | 
            
                8.00
             |                     
            
                4.96
             |                                 
            
                28,500
             |  
            
                 
             |                                                              
             
    
         
    
    
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