| 
                 
                    Closing price on 2/1/2013
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    8.00 | 
                 
                
                    | High | 
                    8.40 | 
                 
                
                    | Low | 
                    8.00 | 
                     
                
                    | Volume | 
                    71,000 | 
                                 
                
                    | Split-adjusted Price | 
                    5.47 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
POT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                2/1/2013
             | 
            
                +0.80 / +10.53%
             |             
            
                8.00
             |           
            
                8.40
             |               
            
                8.00
             |                           
            
                8.40
             | 
            
                8.37
             |                     
            
                5.47
             |                                 
            
                71,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/31/2013
             | 
            
                -0.20 / -2.56%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.50
             |                           
            
                7.60
             | 
            
                7.58
             |                     
            
                4.95
             |                                 
            
                40,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/30/2013
             | 
            
                -0.20 / -2.50%
             |             
            
                7.80
             |           
            
                8.20
             |               
            
                7.80
             |                           
            
                7.80
             | 
            
                7.90
             |                     
            
                5.08
             |                                 
            
                14,900
             |            
            
                 
             |                                       
         
    
        
            | 
                1/29/2013
             | 
            
                +0.10 / +1.27%
             |             
            
                7.80
             |           
            
                8.00
             |               
            
                7.50
             |                           
            
                8.00
             | 
            
                7.73
             |                     
            
                5.21
             |                                 
            
                15,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/28/2013
             | 
            
                -0.30 / -3.66%
             |             
            
                7.90
             |           
            
                8.20
             |               
            
                7.90
             |                           
            
                7.90
             | 
            
                8.07
             |                     
            
                5.14
             |                                 
            
                9,500
             |            
            
                 
             |                                       
         
    
        
            | 
                1/25/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.10
             |           
            
                8.20
             |               
            
                8.10
             |                           
            
                8.20
             | 
            
                8.13
             |                     
            
                5.34
             |                                 
            
                4,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/24/2013
             | 
            
                +0.30 / +3.80%
             |             
            
                8.10
             |           
            
                8.20
             |               
            
                8.10
             |                           
            
                8.20
             | 
            
                8.18
             |                     
            
                5.34
             |                                 
            
                3,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/23/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.00
             |           
            
                8.00
             |               
            
                7.90
             |                           
            
                7.90
             | 
            
                7.99
             |                     
            
                5.14
             |                                 
            
                18,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/22/2013
             | 
            
                -0.70 / -8.14%
             |             
            
                8.20
             |           
            
                8.20
             |               
            
                7.90
             |                           
            
                7.90
             | 
            
                8.04
             |                     
            
                5.14
             |                                 
            
                23,100
             |            
            
                 
             |                                       
         
    
        
            | 
                1/21/2013
             | 
            
                +0.10 / +1.18%
             |             
            
                8.40
             |           
            
                8.60
             |               
            
                8.20
             |                           
            
                8.60
             | 
            
                8.22
             |                     
            
                5.60
             |                                 
            
                9,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/18/2013
             | 
            
                +0.10 / +1.19%
             |             
            
                8.30
             |           
            
                8.50
             |               
            
                8.30
             |                           
            
                8.50
             | 
            
                8.37
             |                     
            
                5.53
             |                                 
            
                13,400
             |            
            
                 
             |                                       
         
    
        
            | 
                1/17/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.70
             |           
            
                8.70
             |               
            
                8.30
             |                           
            
                8.40
             | 
            
                8.46
             |                     
            
                5.47
             |                                 
            
                39,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/16/2013
             | 
            
                -0.60 / -6.67%
             |             
            
                9.00
             |           
            
                9.20
             |               
            
                8.40
             |                           
            
                8.40
             | 
            
                8.81
             |                     
            
                5.47
             |                                 
            
                39,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/15/2013
             | 
            
                +0.70 / +8.43%
             |             
            
                8.30
             |           
            
                9.00
             |               
            
                8.20
             |                           
            
                9.00
             | 
            
                8.71
             |                     
            
                5.86
             |                                 
            
                37,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/14/2013
             | 
            
                +0.20 / +2.47%
             |             
            
                7.90
             |           
            
                8.40
             |               
            
                7.90
             |                           
            
                8.30
             | 
            
                8.19
             |                     
            
                5.40
             |                                 
            
                10,600
             |            
            
                 
             |                                       
         
    
        
            | 
                1/11/2013
             | 
            
                -0.20 / -2.41%
             |             
            
                8.10
             |           
            
                8.20
             |               
            
                8.10
             |                           
            
                8.10
             | 
            
                8.10
             |                     
            
                5.27
             |                                 
            
                13,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/10/2013
             | 
            
                +0.20 / +2.47%
             |             
            
                8.00
             |           
            
                8.30
             |               
            
                8.00
             |                           
            
                8.30
             | 
            
                8.08
             |                     
            
                5.40
             |                                 
            
                9,504
             |            
            
                 
             |                                       
         
    
        
            | 
                1/9/2013
             | 
            
                -0.20 / -2.41%
             |             
            
                8.30
             |           
            
                8.70
             |               
            
                7.90
             |                           
            
                8.10
             | 
            
                8.21
             |                     
            
                5.27
             |                                 
            
                52,129
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/8/2013
             | 
            
                +0.10 / +1.22%
             |             
            
                7.90
             |           
            
                8.30
             |               
            
                7.90
             |                           
            
                8.30
             | 
            
                8.23
             |                     
            
                5.40
             |                                 
            
                27,340
             |            
            
                 
             |                                       
         
    
        
            | 
                1/7/2013
             | 
            
                -0.60 / -6.82%
             |             
            
                8.70
             |           
            
                8.70
             |               
            
                8.20
             |                           
            
                8.20
             | 
            
                8.44
             |                     
            
                5.34
             |                                 
            
                29,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/4/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.80
             |           
            
                8.90
             |               
            
                8.40
             |                           
            
                8.80
             | 
            
                8.63
             |                     
            
                5.73
             |                                 
            
                14,900
             |            
            
                 
             |                                       
         
    
        
            | 
                1/3/2013
             | 
            
                -0.60 / -6.38%
             |             
            
                9.00
             |           
            
                9.10
             |               
            
                8.80
             |                           
            
                8.80
             | 
            
                8.86
             |                     
            
                5.73
             |                                 
            
                46,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/2/2013
             | 
            
                +0.40 / +4.44%
             |             
            
                8.80
             |           
            
                9.40
             |               
            
                8.80
             |                           
            
                9.40
             | 
            
                9.15
             |                     
            
                6.12
             |                                 
            
                20,100
             |            
            
                 
             |                                       
         
    
        
            | 
                12/28/2012
             | 
            
                +0.30 / +3.45%
             |             
            
                8.50
             |           
            
                9.20
             |               
            
                8.50
             |                           
            
                9.00
             | 
            
                8.88
             |                     
            
                5.86
             |                                 
            
                57,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/27/2012
             | 
            
                0.00 / 0.00%
             |             
            
                8.60
             |           
            
                8.80
             |               
            
                8.60
             |                           
            
                8.70
             | 
            
                8.67
             |                     
            
                5.66
             |                                 
            
                86,500
             |            
            
                 
             |                                       
         
    
        
            | 
                12/26/2012
             | 
            
                -0.10 / -1.14%
             |             
            
                8.40
             |           
            
                8.80
             |               
            
                8.10
             |                           
            
                8.70
             | 
            
                8.52
             |                     
            
                5.66
             |                                 
            
                42,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/25/2012
             | 
            
                -0.20 / -2.22%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                8.50
             |                           
            
                8.80
             | 
            
                8.74
             |                     
            
                5.73
             |                                 
            
                34,140
             |            
            
                 
             |                                       
         
    
        
            | 
                12/24/2012
             | 
            
                +0.30 / +3.45%
             |             
            
                9.30
             |           
            
                9.30
             |               
            
                8.70
             |                           
            
                9.00
             | 
            
                9.08
             |                     
            
                5.86
             |                                 
            
                137,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/21/2012
             | 
            
                +0.50 / +6.10%
             |             
            
                8.70
             |           
            
                8.70
             |               
            
                8.70
             |                           
            
                8.70
             | 
            
                8.70
             |                     
            
                5.66
             |                                 
            
                153,100
             |            
            
                 
             |                                       
         
    
        
            | 
                12/20/2012
             | 
            
                +0.50 / +6.49%
             |             
            
                8.20
             |           
            
                8.20
             |               
            
                8.20
             |                           
            
                8.20
             | 
            
                8.20
             |                     
            
                5.34
             |                                 
            
                8,900
             |  
            
                 
             |                                                              
             
    
         
    
    
 |