| 
                 
                    Closing price on 5/31/2013
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    7.60 | 
                 
                
                    | High | 
                    7.60 | 
                 
                
                    | Low | 
                    7.10 | 
                     
                
                    | Volume | 
                    37,228 | 
                                 
                
                    | Split-adjusted Price | 
                    5.00 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
POT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/31/2013
             | 
            
                -0.20 / -2.67%
             |             
            
                7.60
             |           
            
                7.60
             |               
            
                7.10
             |                           
            
                7.30
             | 
            
                7.30
             |                     
            
                5.00
             |                                 
            
                37,228
             |            
            
                 
             |                                       
         
    
        
            | 
                5/30/2013
             | 
            
                +0.10 / +1.35%
             |             
            
                7.40
             |           
            
                7.80
             |               
            
                7.30
             |                           
            
                7.50
             | 
            
                7.43
             |                     
            
                5.14
             |                                 
            
                11,860
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/29/2013
             | 
            
                -0.20 / -2.63%
             |             
            
                7.50
             |           
            
                7.50
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.44
             |                     
            
                5.07
             |                                 
            
                7,500
             |            
            
                 
             |                                       
         
    
        
            | 
                5/28/2013
             | 
            
                -0.20 / -2.56%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.40
             |                           
            
                7.60
             | 
            
                7.51
             |                     
            
                5.21
             |                                 
            
                19,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/27/2013
             | 
            
                +0.10 / +1.30%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.50
             |                           
            
                7.80
             | 
            
                7.63
             |                     
            
                5.35
             |                                 
            
                8,488
             |            
            
                 
             |                                       
         
    
        
            | 
                5/24/2013
             | 
            
                +0.50 / +6.94%
             |             
            
                7.30
             |           
            
                7.70
             |               
            
                7.20
             |                           
            
                7.70
             | 
            
                7.45
             |                     
            
                5.28
             |                                 
            
                17,004
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/23/2013
             | 
            
                -0.20 / -2.70%
             |             
            
                7.40
             |           
            
                7.40
             |               
            
                7.20
             |                           
            
                7.20
             | 
            
                7.29
             |                     
            
                4.93
             |                                 
            
                10,880
             |            
            
                 
             |                                       
         
    
        
            | 
                5/22/2013
             | 
            
                0.00 / 0.00%
             |             
            
                7.30
             |           
            
                7.40
             |               
            
                7.20
             |                           
            
                7.40
             | 
            
                7.31
             |                     
            
                5.07
             |                                 
            
                30,308
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/21/2013
             | 
            
                0.00 / 0.00%
             |             
            
                7.10
             |           
            
                7.40
             |               
            
                7.00
             |                           
            
                7.40
             | 
            
                7.09
             |                     
            
                5.07
             |                                 
            
                9,000
             |            
            
                 
             |                                       
         
    
        
            | 
                5/20/2013
             | 
            
                +0.10 / +1.37%
             |             
            
                7.00
             |           
            
                7.40
             |               
            
                6.90
             |                           
            
                7.40
             | 
            
                7.26
             |                     
            
                5.07
             |                                 
            
                1,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/17/2013
             | 
            
                +0.30 / +4.29%
             |             
            
                7.10
             |           
            
                7.30
             |               
            
                7.00
             |                           
            
                7.30
             | 
            
                7.12
             |                     
            
                5.00
             |                                 
            
                14,274
             |            
            
                 
             |                                       
         
    
        
            | 
                5/16/2013
             | 
            
                -0.70 / -9.09%
             |             
            
                7.60
             |           
            
                7.70
             |               
            
                7.00
             |                           
            
                7.00
             | 
            
                7.18
             |                     
            
                4.80
             |                                 
            
                59,996
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/15/2013
             | 
            
                +0.10 / +1.32%
             |             
            
                7.60
             |           
            
                7.70
             |               
            
                7.60
             |                           
            
                7.70
             | 
            
                7.60
             |                     
            
                5.28
             |                                 
            
                2,400
             |            
            
                 
             |                                       
         
    
        
            | 
                5/14/2013
             | 
            
                -0.10 / -1.30%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.50
             |                           
            
                7.60
             | 
            
                7.62
             |                     
            
                5.21
             |                                 
            
                16,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/13/2013
             | 
            
                -0.10 / -1.28%
             |             
            
                7.60
             |           
            
                7.70
             |               
            
                7.60
             |                           
            
                7.70
             | 
            
                7.67
             |                     
            
                5.28
             |                                 
            
                700
             |            
            
                 
             |                                       
         
    
        
            | 
                5/10/2013
             | 
            
                -0.10 / -1.27%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.70
             |                           
            
                7.80
             | 
            
                7.75
             |                     
            
                5.35
             |                                 
            
                4,416
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/9/2013
             | 
            
                +0.10 / +1.28%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.40
             |                           
            
                7.90
             | 
            
                7.70
             |                     
            
                5.41
             |                                 
            
                7,188
             |            
            
                 
             |                                       
         
    
        
            | 
                5/8/2013
             | 
            
                0.00 / 0.00%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.80
             |                           
            
                7.80
             | 
            
                7.80
             |                     
            
                5.35
             |                                 
            
                7,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/7/2013
             | 
            
                0.00 / 0.00%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.60
             |                           
            
                7.80
             | 
            
                7.65
             |                     
            
                5.35
             |                                 
            
                14,566
             |            
            
                 
             |                                       
         
    
        
            | 
                5/6/2013
             | 
            
                0.00 / 0.00%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.70
             |                           
            
                7.80
             | 
            
                7.79
             |                     
            
                5.35
             |                                 
            
                25,336
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/3/2013
             | 
            
                -0.10 / -1.27%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.70
             |                           
            
                7.80
             | 
            
                7.77
             |                     
            
                5.35
             |                                 
            
                3,300
             |            
            
                 
             |                                       
         
    
        
            | 
                5/2/2013
             | 
            
                0.00 / 0.00%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.90
             |                           
            
                7.90
             | 
            
                7.90
             |                     
            
                5.41
             |                                 
            
                500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/26/2013
             | 
            
                -0.10 / -1.25%
             |             
            
                7.90
             |           
            
                8.00
             |               
            
                7.90
             |                           
            
                7.90
             | 
            
                7.91
             |                     
            
                5.41
             |                                 
            
                3,600
             |            
            
                 
             |                                       
         
    
        
            | 
                4/25/2013
             | 
            
                +0.30 / +3.90%
             |             
            
                7.80
             |           
            
                8.00
             |               
            
                7.80
             |                           
            
                8.00
             | 
            
                7.80
             |                     
            
                5.48
             |                                 
            
                38,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/24/2013
             | 
            
                -0.20 / -2.53%
             |             
            
                7.80
             |           
            
                8.00
             |               
            
                7.70
             |                           
            
                7.70
             | 
            
                7.80
             |                     
            
                5.28
             |                                 
            
                800
             |            
            
                 
             |                                       
         
    
        
            | 
                4/23/2013
             | 
            
                0.00 / 0.00%
             |             
            
                8.10
             |           
            
                8.20
             |               
            
                7.90
             |                           
            
                7.90
             | 
            
                7.91
             |                     
            
                5.41
             |                                 
            
                19,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/22/2013
             | 
            
                +0.10 / +1.28%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.80
             |                           
            
                7.90
             | 
            
                7.84
             |                     
            
                5.41
             |                                 
            
                11,600
             |            
            
                 
             |                                       
         
    
        
            | 
                4/18/2013
             | 
            
                -0.30 / -3.70%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.70
             |                           
            
                7.80
             | 
            
                7.78
             |                     
            
                5.35
             |                                 
            
                11,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/17/2013
             | 
            
                +0.20 / +2.53%
             |             
            
                7.90
             |           
            
                8.10
             |               
            
                7.80
             |                           
            
                8.10
             | 
            
                7.90
             |                     
            
                5.55
             |                                 
            
                14,600
             |            
            
                 
             |                                       
         
    
        
            | 
                4/16/2013
             | 
            
                +0.20 / +2.60%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                7.80
             |                           
            
                7.90
             | 
            
                7.83
             |                     
            
                5.41
             |                                 
            
                3,600
             |  
            
                 
             |                                                              
             
    
         
    
    
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