| 
                 
                    Closing price on 8/20/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    10.90 | 
                 
                
                    | High | 
                    11.20 | 
                 
                
                    | Low | 
                    10.90 | 
                     
                
                    | Volume | 
                    18,500 | 
                                 
                
                    | Split-adjusted Price | 
                    7.16 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
POT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                8/20/2012
             | 
            
                0.00 / 0.00%
             |             
            
                10.90
             |           
            
                11.20
             |               
            
                10.90
             |                           
            
                11.00
             | 
            
                11.02
             |                     
            
                7.16
             |                                 
            
                18,500
             |            
            
                 
             |                                       
         
    
        
            | 
                8/17/2012
             | 
            
                0.00 / 0.00%
             |             
            
                10.90
             |           
            
                11.00
             |               
            
                10.80
             |                           
            
                11.00
             | 
            
                10.92
             |                     
            
                7.16
             |                                 
            
                24,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/16/2012
             | 
            
                +0.10 / +0.92%
             |             
            
                11.00
             |           
            
                11.00
             |               
            
                11.00
             |                           
            
                11.00
             | 
            
                11.00
             |                     
            
                7.16
             |                                 
            
                24,000
             |            
            
                 
             |                                       
         
    
        
            | 
                8/15/2012
             | 
            
                -0.10 / -0.91%
             |             
            
                11.10
             |           
            
                11.10
             |               
            
                10.90
             |                           
            
                10.90
             | 
            
                11.01
             |                     
            
                7.10
             |                                 
            
                49,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/14/2012
             | 
            
                +0.10 / +0.92%
             |             
            
                10.90
             |           
            
                11.40
             |               
            
                10.90
             |                           
            
                11.00
             | 
            
                11.00
             |                     
            
                7.16
             |                                 
            
                41,000
             |            
            
                 
             |                                       
         
    
        
            | 
                8/13/2012
             | 
            
                0.00 / 0.00%
             |             
            
                11.00
             |           
            
                11.00
             |               
            
                10.70
             |                           
            
                10.90
             | 
            
                10.93
             |                     
            
                7.10
             |                                 
            
                45,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/10/2012
             | 
            
                -0.40 / -3.54%
             |             
            
                10.90
             |           
            
                11.30
             |               
            
                10.80
             |                           
            
                10.90
             | 
            
                10.89
             |                     
            
                7.10
             |                                 
            
                47,159
             |            
            
                 
             |                                       
         
    
        
            | 
                8/9/2012
             | 
            
                0.00 / 0.00%
             |             
            
                11.10
             |           
            
                11.70
             |               
            
                10.90
             |                           
            
                11.30
             | 
            
                11.22
             |                     
            
                7.36
             |                                 
            
                46,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/8/2012
             | 
            
                +0.30 / +2.73%
             |             
            
                10.70
             |           
            
                11.30
             |               
            
                10.70
             |                           
            
                11.30
             | 
            
                11.25
             |                     
            
                7.36
             |                                 
            
                2,540
             |            
            
                 
             |                                       
         
    
        
            | 
                8/7/2012
             | 
            
                -0.30 / -2.65%
             |             
            
                11.10
             |           
            
                11.10
             |               
            
                10.80
             |                           
            
                11.00
             | 
            
                11.06
             |                     
            
                7.16
             |                                 
            
                23,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/6/2012
             | 
            
                +0.50 / +4.63%
             |             
            
                10.90
             |           
            
                11.50
             |               
            
                10.90
             |                           
            
                11.30
             | 
            
                11.18
             |                     
            
                7.36
             |                                 
            
                78,280
             |            
            
                 
             |                                       
         
    
        
            | 
                8/3/2012
             | 
            
                +0.10 / +0.93%
             |             
            
                10.50
             |           
            
                10.80
             |               
            
                10.50
             |                           
            
                10.80
             | 
            
                10.73
             |                     
            
                7.03
             |                                 
            
                30,054
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/2/2012
             | 
            
                -0.10 / -0.93%
             |             
            
                10.90
             |           
            
                10.90
             |               
            
                10.70
             |                           
            
                10.70
             | 
            
                10.80
             |                     
            
                6.97
             |                                 
            
                60,200
             |            
            
                 
             |                                       
         
    
        
            | 
                8/1/2012
             | 
            
                0.00 / 0.00%
             |             
            
                11.00
             |           
            
                11.00
             |               
            
                10.50
             |                           
            
                10.80
             | 
            
                10.76
             |                     
            
                7.03
             |                                 
            
                40,916
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/31/2012
             | 
            
                +0.20 / +1.89%
             |             
            
                10.80
             |           
            
                10.80
             |               
            
                10.60
             |                           
            
                10.80
             | 
            
                10.69
             |                     
            
                7.03
             |                                 
            
                25,386
             |            
            
                 
             |                                       
         
    
        
            | 
                7/30/2012
             | 
            
                -0.60 / -5.36%
             |             
            
                10.90
             |           
            
                11.00
             |               
            
                10.50
             |                           
            
                10.60
             | 
            
                10.72
             |                     
            
                6.90
             |                                 
            
                56,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/27/2012
             | 
            
                0.00 / 0.00%
             |             
            
                11.20
             |           
            
                11.80
             |               
            
                11.00
             |                           
            
                11.20
             | 
            
                11.41
             |                     
            
                7.29
             |                                 
            
                101,408
             |            
            
                 
             |                                       
         
    
        
            | 
                7/26/2012
             | 
            
                0.00 / 0.00%
             |             
            
                11.20
             |           
            
                11.40
             |               
            
                10.90
             |                           
            
                11.20
             | 
            
                11.13
             |                     
            
                7.29
             |                                 
            
                39,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/25/2012
             | 
            
                0.00 / 0.00%
             |             
            
                11.00
             |           
            
                11.30
             |               
            
                10.90
             |                           
            
                11.20
             | 
            
                11.17
             |                     
            
                7.29
             |                                 
            
                38,100
             |            
            
                 
             |                                       
         
    
        
            | 
                7/24/2012
             | 
            
                -1.00 / -8.20%
             |             
            
                11.80
             |           
            
                11.80
             |               
            
                11.20
             |                           
            
                11.20
             | 
            
                11.28
             |                     
            
                7.29
             |                                 
            
                113,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/23/2012
             | 
            
                +0.40 / +3.39%
             |             
            
                12.60
             |           
            
                12.60
             |               
            
                11.80
             |                           
            
                12.20
             | 
            
                12.30
             |                     
            
                7.94
             |                                 
            
                125,208
             |            
            
                 
             |                                       
         
    
        
            | 
                7/20/2012
             | 
            
                +0.70 / +6.31%
             |             
            
                11.50
             |           
            
                11.80
             |               
            
                11.50
             |                           
            
                11.80
             | 
            
                11.78
             |                     
            
                7.68
             |                                 
            
                317,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/19/2012
             | 
            
                +0.70 / +6.73%
             |             
            
                10.60
             |           
            
                11.10
             |               
            
                10.30
             |                           
            
                11.10
             | 
            
                10.85
             |                     
            
                7.23
             |                                 
            
                69,200
             |            
            
                 
             |                                       
         
    
        
            | 
                7/18/2012
             | 
            
                -0.40 / -3.70%
             |             
            
                10.70
             |           
            
                10.80
             |               
            
                10.40
             |                           
            
                10.40
             | 
            
                10.46
             |                     
            
                6.77
             |                                 
            
                28,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/17/2012
             | 
            
                +0.40 / +3.85%
             |             
            
                10.50
             |           
            
                11.00
             |               
            
                10.50
             |                           
            
                10.80
             | 
            
                10.68
             |                     
            
                7.03
             |                                 
            
                20,100
             |            
            
                 
             |                                       
         
    
        
            | 
                7/16/2012
             | 
            
                -0.50 / -4.59%
             |             
            
                10.90
             |           
            
                10.90
             |               
            
                10.40
             |                           
            
                10.40
             | 
            
                10.54
             |                     
            
                6.77
             |                                 
            
                33,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/13/2012
             | 
            
                +0.50 / +4.81%
             |             
            
                10.60
             |           
            
                11.00
             |               
            
                10.40
             |                           
            
                10.90
             | 
            
                10.69
             |                     
            
                7.10
             |                                 
            
                94,000
             |            
            
                 
             |                                       
         
    
        
            | 
                7/12/2012
             | 
            
                +0.50 / +5.05%
             |             
            
                10.00
             |           
            
                10.40
             |               
            
                9.90
             |                           
            
                10.40
             | 
            
                10.20
             |                     
            
                6.77
             |                                 
            
                52,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/11/2012
             | 
            
                +0.10 / +1.02%
             |             
            
                10.00
             |           
            
                10.00
             |               
            
                9.80
             |                           
            
                9.90
             | 
            
                9.93
             |                     
            
                6.45
             |                                 
            
                35,800
             |            
            
                 
             |                                       
         
    
        
            | 
                7/10/2012
             | 
            
                0.00 / 0.00%
             |             
            
                9.90
             |           
            
                10.00
             |               
            
                9.60
             |                           
            
                9.80
             | 
            
                9.87
             |                     
            
                6.38
             |                                 
            
                9,361
             |  
            
                 
             |                                                              
             
    
         
    
    
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