| 
                 
                    Closing price on 1/9/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    8.00 | 
                 
                
                    | High | 
                    8.10 | 
                 
                
                    | Low | 
                    7.60 | 
                     
                
                    | Volume | 
                    2,500 | 
                                 
                
                    | Split-adjusted Price | 
                    4.83 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
POT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                1/9/2012
             | 
            
                +0.10 / +1.32%
             |             
            
                8.00
             |           
            
                8.10
             |               
            
                7.60
             |                           
            
                7.70
             | 
            
                7.74
             |                     
            
                4.83
             |                                 
            
                2,500
             |            
            
                 
             |                                       
         
    
        
            | 
                1/6/2012
             | 
            
                +0.20 / +2.70%
             |             
            
                7.60
             |           
            
                7.60
             |               
            
                7.60
             |                           
            
                7.60
             | 
            
                7.60
             |                     
            
                4.77
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/5/2012
             | 
            
                -0.20 / -2.63%
             |             
            
                7.60
             |           
            
                7.60
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.57
             |                     
            
                4.64
             |                                 
            
                600
             |            
            
                 
             |                                       
         
    
        
            | 
                1/4/2012
             | 
            
                +0.20 / +2.70%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.60
             |                           
            
                7.60
             | 
            
                7.64
             |                     
            
                4.77
             |                                 
            
                1,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/3/2012
             | 
            
                -0.40 / -5.13%
             |             
            
                7.50
             |           
            
                7.50
             |               
            
                7.30
             |                           
            
                7.40
             | 
            
                7.39
             |                     
            
                4.64
             |                                 
            
                7,100
             |            
            
                 
             |                                       
         
    
        
            | 
                12/30/2011
             | 
            
                +0.10 / +1.30%
             |             
            
                8.00
             |           
            
                8.10
             |               
            
                7.70
             |                           
            
                7.80
             | 
            
                7.75
             |                     
            
                4.89
             |                                 
            
                26,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/29/2011
             | 
            
                +0.50 / +6.94%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.30
             |                           
            
                7.70
             | 
            
                7.70
             |                     
            
                4.83
             |                                 
            
                30,600
             |            
            
                 
             |                                       
         
    
        
            | 
                12/28/2011
             | 
            
                +0.40 / +5.88%
             |             
            
                7.10
             |           
            
                7.20
             |               
            
                7.10
             |                           
            
                7.20
             | 
            
                7.17
             |                     
            
                4.52
             |                                 
            
                25,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/27/2011
             | 
            
                -0.20 / -2.86%
             |             
            
                7.00
             |           
            
                7.20
             |               
            
                6.70
             |                           
            
                6.80
             | 
            
                6.82
             |                     
            
                4.27
             |                                 
            
                21,600
             |            
            
                 
             |                                       
         
    
        
            | 
                12/26/2011
             | 
            
                -0.40 / -5.41%
             |             
            
                7.50
             |           
            
                7.60
             |               
            
                7.00
             |                           
            
                7.00
             | 
            
                7.17
             |                     
            
                4.39
             |                                 
            
                22,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/23/2011
             | 
            
                +0.30 / +4.23%
             |             
            
                6.90
             |           
            
                7.40
             |               
            
                6.90
             |                           
            
                7.40
             | 
            
                7.28
             |                     
            
                4.64
             |                                 
            
                1,200
             |            
            
                 
             |                                       
         
    
        
            | 
                12/22/2011
             | 
            
                -0.40 / -5.33%
             |             
            
                7.50
             |           
            
                7.60
             |               
            
                7.10
             |                           
            
                7.10
             | 
            
                7.27
             |                     
            
                4.46
             |                                 
            
                10,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/21/2011
             | 
            
                +0.30 / +4.17%
             |             
            
                7.40
             |           
            
                7.50
             |               
            
                7.40
             |                           
            
                7.50
             | 
            
                7.45
             |                     
            
                4.71
             |                                 
            
                12,100
             |            
            
                 
             |                                       
         
    
        
            | 
                12/20/2011
             | 
            
                -0.20 / -2.70%
             |             
            
                7.60
             |           
            
                7.60
             |               
            
                7.20
             |                           
            
                7.20
             | 
            
                7.41
             |                     
            
                4.52
             |                                 
            
                11,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/19/2011
             | 
            
                -0.20 / -2.63%
             |             
            
                7.60
             |           
            
                7.60
             |               
            
                7.10
             |                           
            
                7.40
             | 
            
                7.34
             |                     
            
                4.64
             |                                 
            
                9,700
             |            
            
                 
             |                                       
         
    
        
            | 
                12/16/2011
             | 
            
                -0.10 / -1.30%
             |             
            
                7.20
             |           
            
                7.80
             |               
            
                7.20
             |                           
            
                7.60
             | 
            
                7.61
             |                     
            
                4.77
             |                                 
            
                11,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/15/2011
             | 
            
                +0.50 / +6.94%
             |             
            
                6.90
             |           
            
                7.70
             |               
            
                6.80
             |                           
            
                7.70
             | 
            
                7.30
             |                     
            
                4.83
             |                                 
            
                4,600
             |            
            
                 
             |                                       
         
    
        
            | 
                12/14/2011
             | 
            
                -0.50 / -6.49%
             |             
            
                7.60
             |           
            
                7.60
             |               
            
                7.20
             |                           
            
                7.20
             | 
            
                7.28
             |                     
            
                4.52
             |                                 
            
                28,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/13/2011
             | 
            
                +0.30 / +4.05%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.70
             |                           
            
                7.70
             | 
            
                7.75
             |                     
            
                4.83
             |                                 
            
                2,900
             |            
            
                 
             |                                       
         
    
        
            | 
                12/12/2011
             | 
            
                -0.40 / -5.13%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.72
             |                     
            
                4.64
             |                                 
            
                17,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/9/2011
             | 
            
                -0.20 / -2.50%
             |             
            
                7.80
             |           
            
                7.90
             |               
            
                7.40
             |                           
            
                7.80
             | 
            
                7.70
             |                     
            
                4.89
             |                                 
            
                13,600
             |            
            
                 
             |                                       
         
    
        
            | 
                12/8/2011
             | 
            
                +0.20 / +2.56%
             |             
            
                7.90
             |           
            
                8.00
             |               
            
                7.90
             |                           
            
                8.00
             | 
            
                7.94
             |                     
            
                5.02
             |                                 
            
                13,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/7/2011
             | 
            
                -0.30 / -3.70%
             |             
            
                7.90
             |           
            
                8.10
             |               
            
                7.80
             |                           
            
                7.80
             | 
            
                7.92
             |                     
            
                4.89
             |                                 
            
                16,700
             |            
            
                 
             |                                       
         
    
        
            | 
                12/6/2011
             | 
            
                -0.70 / -7.95%
             |             
            
                8.60
             |           
            
                8.60
             |               
            
                8.10
             |                           
            
                8.10
             | 
            
                8.20
             |                     
            
                5.08
             |                                 
            
                28,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/5/2011
             | 
            
                +0.30 / +3.53%
             |             
            
                8.90
             |           
            
                8.90
             |               
            
                8.20
             |                           
            
                8.80
             | 
            
                8.66
             |                     
            
                5.52
             |                                 
            
                19,400
             |            
            
                 
             |                                       
         
    
        
            | 
                12/2/2011
             | 
            
                0.00 / 0.00%
             |             
            
                8.80
             |           
            
                8.80
             |               
            
                8.30
             |                           
            
                8.50
             | 
            
                8.63
             |                     
            
                5.33
             |                                 
            
                2,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/1/2011
             | 
            
                +0.50 / +6.25%
             |             
            
                8.20
             |           
            
                8.50
             |               
            
                8.20
             |                           
            
                8.50
             | 
            
                8.48
             |                     
            
                5.33
             |                                 
            
                23,900
             |            
            
                 
             |                                       
         
    
        
            | 
                11/30/2011
             | 
            
                +0.50 / +6.67%
             |             
            
                7.90
             |           
            
                8.00
             |               
            
                7.70
             |                           
            
                8.00
             | 
            
                7.99
             |                     
            
                5.02
             |                                 
            
                55,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/29/2011
             | 
            
                +0.10 / +1.35%
             |             
            
                7.40
             |           
            
                7.60
             |               
            
                7.40
             |                           
            
                7.50
             | 
            
                7.48
             |                     
            
                4.71
             |                                 
            
                11,300
             |            
            
                 
             |                                       
         
    
        
            | 
                11/28/2011
             | 
            
                +0.10 / +1.37%
             |             
            
                7.00
             |           
            
                7.50
             |               
            
                7.00
             |                           
            
                7.40
             | 
            
                7.42
             |                     
            
                4.64
             |                                 
            
                12,800
             |  
            
                 
             |                                                              
             
    
         
    
    
 |