| 
                 
                    Closing price on 11/11/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    9.20 | 
                 
                
                    | High | 
                    9.20 | 
                 
                
                    | Low | 
                    8.80 | 
                     
                
                    | Volume | 
                    26,900 | 
                                 
                
                    | Split-adjusted Price | 
                    5.58 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
POT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                11/11/2011
             | 
            
                -0.10 / -1.11%
             |             
            
                9.20
             |           
            
                9.20
             |               
            
                8.80
             |                           
            
                8.90
             | 
            
                8.98
             |                     
            
                5.58
             |                                 
            
                26,900
             |            
            
                 
             |                                       
         
    
        
            | 
                11/10/2011
             | 
            
                -0.20 / -2.17%
             |             
            
                9.20
             |           
            
                9.20
             |               
            
                8.90
             |                           
            
                9.00
             | 
            
                9.00
             |                     
            
                5.65
             |                                 
            
                63,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/9/2011
             | 
            
                -0.50 / -5.15%
             |             
            
                9.60
             |           
            
                9.70
             |               
            
                9.20
             |                           
            
                9.20
             | 
            
                9.38
             |                     
            
                5.77
             |                                 
            
                32,100
             |            
            
                 
             |                                       
         
    
        
            | 
                11/8/2011
             | 
            
                +0.60 / +6.59%
             |             
            
                9.40
             |           
            
                9.70
             |               
            
                9.20
             |                           
            
                9.70
             | 
            
                9.42
             |                     
            
                6.09
             |                                 
            
                13,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/7/2011
             | 
            
                -0.20 / -2.15%
             |             
            
                9.50
             |           
            
                9.60
             |               
            
                9.00
             |                           
            
                9.10
             | 
            
                9.26
             |                     
            
                5.71
             |                                 
            
                50,800
             |            
            
                 
             |                                       
         
    
        
            | 
                11/4/2011
             | 
            
                -0.20 / -2.11%
             |             
            
                10.00
             |           
            
                10.00
             |               
            
                9.30
             |                           
            
                9.30
             | 
            
                9.52
             |                     
            
                5.84
             |                                 
            
                34,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/3/2011
             | 
            
                -0.20 / -2.06%
             |             
            
                10.00
             |           
            
                10.10
             |               
            
                9.40
             |                           
            
                9.50
             | 
            
                9.66
             |                     
            
                5.96
             |                                 
            
                32,900
             |            
            
                 
             |                                       
         
    
        
            | 
                11/2/2011
             | 
            
                -0.60 / -5.83%
             |             
            
                10.00
             |           
            
                10.00
             |               
            
                9.70
             |                           
            
                9.70
             | 
            
                9.73
             |                     
            
                6.09
             |                                 
            
                33,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/1/2011
             | 
            
                -0.20 / -1.90%
             |             
            
                10.70
             |           
            
                11.00
             |               
            
                10.30
             |                           
            
                10.30
             | 
            
                10.37
             |                     
            
                6.46
             |                                 
            
                20,200
             |            
            
                 
             |                                       
         
    
        
            | 
                10/31/2011
             | 
            
                -0.30 / -2.78%
             |             
            
                11.00
             |           
            
                11.50
             |               
            
                10.50
             |                           
            
                10.50
             | 
            
                10.98
             |                     
            
                6.59
             |                                 
            
                46,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/28/2011
             | 
            
                +0.70 / +6.93%
             |             
            
                10.80
             |           
            
                10.80
             |               
            
                10.60
             |                           
            
                10.80
             | 
            
                10.77
             |                     
            
                6.78
             |                                 
            
                48,100
             |            
            
                 
             |                                       
         
    
        
            | 
                10/27/2011
             | 
            
                +0.70 / +7.45%
             |             
            
                9.70
             |           
            
                10.10
             |               
            
                9.70
             |                           
            
                10.10
             | 
            
                10.07
             |                     
            
                6.34
             |                                 
            
                52,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/26/2011
             | 
            
                -0.10 / -1.05%
             |             
            
                9.40
             |           
            
                9.90
             |               
            
                9.20
             |                           
            
                9.40
             | 
            
                9.47
             |                     
            
                5.90
             |                                 
            
                11,500
             |            
            
                 
             |                                       
         
    
        
            | 
                10/25/2011
             | 
            
                +0.10 / +1.06%
             |             
            
                9.30
             |           
            
                9.60
             |               
            
                9.30
             |                           
            
                9.50
             | 
            
                9.45
             |                     
            
                5.96
             |                                 
            
                16,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/24/2011
             | 
            
                -0.30 / -3.09%
             |             
            
                9.70
             |           
            
                9.80
             |               
            
                9.10
             |                           
            
                9.40
             | 
            
                9.51
             |                     
            
                5.90
             |                                 
            
                20,400
             |            
            
                 
             |                                       
         
    
        
            | 
                10/21/2011
             | 
            
                +0.40 / +4.30%
             |             
            
                9.50
             |           
            
                9.70
             |               
            
                9.30
             |                           
            
                9.70
             | 
            
                9.61
             |                     
            
                6.09
             |                                 
            
                36,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/20/2011
             | 
            
                0.00 / 0.00%
             |             
            
                9.70
             |           
            
                9.70
             |               
            
                9.10
             |                           
            
                9.30
             | 
            
                9.47
             |                     
            
                5.84
             |                                 
            
                17,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/19/2011
             | 
            
                0.00 / 0.00%
             |             
            
                8.90
             |           
            
                9.90
             |               
            
                8.90
             |                           
            
                9.30
             | 
            
                9.47
             |                     
            
                5.84
             |                                 
            
                37,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/18/2011
             | 
            
                -0.60 / -6.06%
             |             
            
                10.00
             |           
            
                10.00
             |               
            
                9.30
             |                           
            
                9.30
             | 
            
                9.34
             |                     
            
                5.84
             |                                 
            
                95,800
             |            
            
                 
             |                                       
         
    
        
            | 
                10/17/2011
             | 
            
                -0.60 / -5.71%
             |             
            
                10.70
             |           
            
                10.80
             |               
            
                9.90
             |                           
            
                9.90
             | 
            
                9.97
             |                     
            
                6.21
             |                                 
            
                61,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/14/2011
             | 
            
                +0.40 / +3.96%
             |             
            
                9.80
             |           
            
                10.90
             |               
            
                9.80
             |                           
            
                10.50
             | 
            
                10.59
             |                     
            
                6.59
             |                                 
            
                49,400
             |            
            
                 
             |                                       
         
    
        
            | 
                10/13/2011
             | 
            
                -0.60 / -5.61%
             |             
            
                10.10
             |           
            
                10.70
             |               
            
                10.10
             |                           
            
                10.10
             | 
            
                10.17
             |                     
            
                6.34
             |                                 
            
                106,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/12/2011
             | 
            
                -0.70 / -6.14%
             |             
            
                11.50
             |           
            
                11.60
             |               
            
                10.70
             |                           
            
                10.70
             | 
            
                10.78
             |                     
            
                6.71
             |                                 
            
                106,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/11/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.00
             |           
            
                12.10
             |               
            
                11.30
             |                           
            
                11.40
             | 
            
                11.46
             |                     
            
                7.15
             |                                 
            
                59,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/10/2011
             | 
            
                -0.40 / -3.39%
             |             
            
                12.00
             |           
            
                12.20
             |               
            
                11.40
             |                           
            
                11.40
             | 
            
                11.57
             |                     
            
                7.15
             |                                 
            
                51,500
             |            
            
                 
             |                                       
         
    
        
            | 
                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
             |  
            
                 
             |                                                              
             
    
         
    
    
 |