| 
                 
                    Closing price on 4/20/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    13.10 | 
                 
                
                    | High | 
                    13.40 | 
                 
                
                    | Low | 
                    13.10 | 
                     
                
                    | Volume | 
                    65,430 | 
                                 
                
                    | Split-adjusted Price | 
                    3.28 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PET Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/20/2011
             | 
            
                -0.20 / -1.49%
             |             
            
                13.10
             |           
            
                13.40
             |               
            
                13.10
             |                           
            
                13.20
             | 
            
                13.20
             |                     
            
                3.28
             |                                 
            
                65,430
             |            
            
                 
             |                                       
         
    
        
            | 
                4/19/2011
             | 
            
                0.00 / 0.00%
             |             
            
                13.20
             |           
            
                13.50
             |               
            
                13.20
             |                           
            
                13.40
             | 
            
                13.40
             |                     
            
                3.33
             |                                 
            
                40,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2011
             | 
            
                -0.20 / -1.47%
             |             
            
                13.50
             |           
            
                13.60
             |               
            
                13.40
             |                           
            
                13.40
             | 
            
                13.40
             |                     
            
                3.33
             |                                 
            
                201,740
             |            
            
                 
             |                                       
         
    
        
            | 
                4/15/2011
             | 
            
                -0.10 / -0.73%
             |             
            
                13.60
             |           
            
                13.70
             |               
            
                13.60
             |                           
            
                13.60
             | 
            
                13.60
             |                     
            
                3.38
             |                                 
            
                85,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/14/2011
             | 
            
                -0.10 / -0.72%
             |             
            
                13.70
             |           
            
                13.80
             |               
            
                13.70
             |                           
            
                13.70
             | 
            
                13.70
             |                     
            
                3.40
             |                                 
            
                82,030
             |            
            
                 
             |                                       
         
    
        
            | 
                4/13/2011
             | 
            
                0.00 / 0.00%
             |             
            
                13.70
             |           
            
                13.80
             |               
            
                13.70
             |                           
            
                13.80
             | 
            
                13.80
             |                     
            
                3.43
             |                                 
            
                105,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/8/2011
             | 
            
                +0.20 / +1.47%
             |             
            
                13.60
             |           
            
                13.90
             |               
            
                13.50
             |                           
            
                13.80
             | 
            
                13.80
             |                     
            
                3.43
             |                                 
            
                129,420
             |            
            
                 
             |                                       
         
    
        
            | 
                4/7/2011
             | 
            
                -0.30 / -2.16%
             |             
            
                13.90
             |           
            
                14.00
             |               
            
                13.60
             |                           
            
                13.60
             | 
            
                13.60
             |                     
            
                3.38
             |                                 
            
                176,520
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/6/2011
             | 
            
                +0.10 / +0.72%
             |             
            
                13.80
             |           
            
                14.00
             |               
            
                13.80
             |                           
            
                13.90
             | 
            
                13.90
             |                     
            
                3.45
             |                                 
            
                263,290
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2011
             | 
            
                -0.20 / -1.43%
             |             
            
                13.80
             |           
            
                14.00
             |               
            
                13.80
             |                           
            
                13.80
             | 
            
                13.80
             |                     
            
                3.43
             |                                 
            
                106,880
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/4/2011
             | 
            
                -0.10 / -0.71%
             |             
            
                14.10
             |           
            
                14.10
             |               
            
                13.90
             |                           
            
                14.00
             | 
            
                14.00
             |                     
            
                3.48
             |                                 
            
                110,710
             |            
            
                 
             |                                       
         
    
        
            | 
                4/1/2011
             | 
            
                -0.20 / -1.40%
             |             
            
                14.10
             |           
            
                14.10
             |               
            
                13.90
             |                           
            
                14.10
             | 
            
                14.10
             |                     
            
                3.50
             |                                 
            
                143,350
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/31/2011
             | 
            
                -0.10 / -0.69%
             |             
            
                14.50
             |           
            
                14.50
             |               
            
                14.10
             |                           
            
                14.30
             | 
            
                14.30
             |                     
            
                3.55
             |                                 
            
                123,060
             |            
            
                 
             |                                       
         
    
        
            | 
                3/30/2011
             | 
            
                -0.10 / -0.69%
             |             
            
                14.10
             |           
            
                14.40
             |               
            
                14.10
             |                           
            
                14.40
             | 
            
                14.40
             |                     
            
                3.58
             |                                 
            
                165,060
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/29/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.40
             |           
            
                14.50
             |               
            
                14.10
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                139,770
             |            
            
                 
             |                                       
         
    
        
            | 
                3/28/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.70
             |           
            
                14.70
             |               
            
                14.30
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                115,630
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/25/2011
             | 
            
                -0.10 / -0.68%
             |             
            
                14.40
             |           
            
                14.60
             |               
            
                14.40
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                87,140
             |            
            
                 
             |                                       
         
    
        
            | 
                3/24/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.60
             |           
            
                14.60
             |               
            
                14.50
             |                           
            
                14.60
             | 
            
                14.60
             |                     
            
                3.63
             |                                 
            
                82,120
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/23/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.60
             |           
            
                14.70
             |               
            
                14.40
             |                           
            
                14.60
             | 
            
                14.60
             |                     
            
                3.63
             |                                 
            
                103,360
             |            
            
                 
             |                                       
         
    
        
            | 
                3/22/2011
             | 
            
                -0.10 / -0.68%
             |             
            
                14.70
             |           
            
                14.70
             |               
            
                14.40
             |                           
            
                14.60
             | 
            
                14.60
             |                     
            
                3.63
             |                                 
            
                97,270
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/21/2011
             | 
            
                0.00 / 0.00%
             |             
            
                15.20
             |           
            
                15.20
             |               
            
                14.60
             |                           
            
                14.70
             | 
            
                14.70
             |                     
            
                3.65
             |                                 
            
                220,960
             |            
            
                 
             |                                       
         
    
        
            | 
                3/18/2011
             | 
            
                +0.20 / +1.38%
             |             
            
                14.60
             |           
            
                14.70
             |               
            
                14.40
             |                           
            
                14.70
             | 
            
                14.70
             |                     
            
                3.65
             |                                 
            
                165,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/17/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.50
             |           
            
                14.90
             |               
            
                14.30
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                161,020
             |            
            
                 
             |                                       
         
    
        
            | 
                3/16/2011
             | 
            
                +0.30 / +2.11%
             |             
            
                14.00
             |           
            
                14.50
             |               
            
                14.00
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                265,950
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/15/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.00
             |           
            
                14.50
             |               
            
                14.00
             |                           
            
                14.20
             | 
            
                14.20
             |                     
            
                3.53
             |                                 
            
                161,290
             |            
            
                 
             |                                       
         
    
        
            | 
                3/14/2011
             | 
            
                -0.60 / -4.05%
             |             
            
                14.80
             |           
            
                14.80
             |               
            
                14.10
             |                           
            
                14.20
             | 
            
                14.20
             |                     
            
                3.53
             |                                 
            
                263,860
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/11/2011
             | 
            
                +0.70 / +4.96%
             |             
            
                14.60
             |           
            
                14.80
             |               
            
                14.60
             |                           
            
                14.80
             | 
            
                14.80
             |                     
            
                3.68
             |                                 
            
                397,280
             |            
            
                 
             |                                       
         
    
        
            | 
                3/10/2011
             | 
            
                +0.60 / +4.44%
             |             
            
                13.50
             |           
            
                14.10
             |               
            
                13.50
             |                           
            
                14.10
             | 
            
                14.10
             |                     
            
                3.50
             |                                 
            
                148,450
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/9/2011
             | 
            
                -0.10 / -0.74%
             |             
            
                13.60
             |           
            
                13.60
             |               
            
                13.20
             |                           
            
                13.50
             | 
            
                13.50
             |                     
            
                3.35
             |                                 
            
                98,190
             |            
            
                 
             |                                       
         
    
        
            | 
                3/8/2011
             | 
            
                0.00 / 0.00%
             |             
            
                13.50
             |           
            
                13.80
             |               
            
                13.50
             |                           
            
                13.60
             | 
            
                13.60
             |                     
            
                3.38
             |                                 
            
                103,230
             |  
            
                 
             |                                                              
             
    
         
    
    
 |