| 
                 
                    Closing price on 5/31/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    14.30 | 
                 
                
                    | High | 
                    14.70 | 
                 
                
                    | Low | 
                    14.20 | 
                     
                
                    | Volume | 
                    301,960 | 
                                 
                
                    | Split-adjusted Price | 
                    14.70 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
OGC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/31/2011
             | 
            
                +0.40 / +2.80%
             |             
            
                14.30
             |           
            
                14.70
             |               
            
                14.20
             |                           
            
                14.70
             | 
            
                14.70
             |                     
            
                14.70
             |                                 
            
                301,960
             |            
            
                 
             |                                       
         
    
        
            | 
                5/30/2011
             | 
            
                -0.60 / -4.03%
             |             
            
                15.50
             |           
            
                15.50
             |               
            
                14.30
             |                           
            
                14.30
             | 
            
                14.30
             |                     
            
                14.30
             |                                 
            
                217,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/27/2011
             | 
            
                +0.70 / +4.93%
             |             
            
                14.80
             |           
            
                14.90
             |               
            
                14.50
             |                           
            
                14.90
             | 
            
                14.90
             |                     
            
                14.90
             |                                 
            
                256,750
             |            
            
                 
             |                                       
         
    
        
            | 
                5/26/2011
             | 
            
                -0.70 / -4.70%
             |             
            
                14.20
             |           
            
                15.00
             |               
            
                14.20
             |                           
            
                14.20
             | 
            
                14.20
             |                     
            
                14.20
             |                                 
            
                926,270
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/25/2011
             | 
            
                -0.70 / -4.49%
             |             
            
                14.90
             |           
            
                15.40
             |               
            
                14.90
             |                           
            
                14.90
             | 
            
                14.90
             |                     
            
                14.90
             |                                 
            
                554,880
             |            
            
                 
             |                                       
         
    
        
            | 
                5/24/2011
             | 
            
                -0.80 / -4.88%
             |             
            
                16.40
             |           
            
                16.40
             |               
            
                15.60
             |                           
            
                15.60
             | 
            
                15.60
             |                     
            
                15.60
             |                                 
            
                83,920
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/23/2011
             | 
            
                -0.70 / -4.09%
             |             
            
                17.10
             |           
            
                17.10
             |               
            
                16.40
             |                           
            
                16.40
             | 
            
                16.40
             |                     
            
                16.40
             |                                 
            
                451,790
             |            
            
                 
             |                                       
         
    
        
            | 
                5/20/2011
             | 
            
                -0.20 / -1.16%
             |             
            
                17.50
             |           
            
                17.50
             |               
            
                17.00
             |                           
            
                17.10
             | 
            
                17.10
             |                     
            
                17.10
             |                                 
            
                260,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/19/2011
             | 
            
                -0.10 / -0.57%
             |             
            
                17.40
             |           
            
                17.50
             |               
            
                17.30
             |                           
            
                17.30
             | 
            
                17.30
             |                     
            
                17.30
             |                                 
            
                271,770
             |            
            
                 
             |                                       
         
    
        
            | 
                5/18/2011
             | 
            
                0.00 / 0.00%
             |             
            
                17.40
             |           
            
                17.80
             |               
            
                17.40
             |                           
            
                17.40
             | 
            
                17.40
             |                     
            
                17.40
             |                                 
            
                195,580
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/17/2011
             | 
            
                -0.40 / -2.25%
             |             
            
                17.30
             |           
            
                17.80
             |               
            
                17.20
             |                           
            
                17.40
             | 
            
                17.40
             |                     
            
                17.40
             |                                 
            
                75,670
             |            
            
                 
             |                                       
         
    
        
            | 
                5/16/2011
             | 
            
                0.00 / 0.00%
             |             
            
                17.80
             |           
            
                17.80
             |               
            
                17.50
             |                           
            
                17.80
             | 
            
                17.80
             |                     
            
                17.80
             |                                 
            
                2,084,830
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/13/2011
             | 
            
                -0.10 / -0.56%
             |             
            
                18.00
             |           
            
                18.00
             |               
            
                17.80
             |                           
            
                17.80
             | 
            
                17.80
             |                     
            
                17.80
             |                                 
            
                79,030
             |            
            
                 
             |                                       
         
    
        
            | 
                5/12/2011
             | 
            
                -0.10 / -0.56%
             |             
            
                18.00
             |           
            
                18.00
             |               
            
                17.90
             |                           
            
                17.90
             | 
            
                17.90
             |                     
            
                17.90
             |                                 
            
                55,690
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/11/2011
             | 
            
                0.00 / 0.00%
             |             
            
                18.00
             |           
            
                18.00
             |               
            
                17.90
             |                           
            
                18.00
             | 
            
                18.00
             |                     
            
                18.00
             |                                 
            
                110,230
             |            
            
                 
             |                                       
         
    
        
            | 
                5/10/2011
             | 
            
                0.00 / 0.00%
             |             
            
                18.00
             |           
            
                18.00
             |               
            
                17.90
             |                           
            
                18.00
             | 
            
                18.00
             |                     
            
                18.00
             |                                 
            
                91,420
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/9/2011
             | 
            
                -0.10 / -0.55%
             |             
            
                18.00
             |           
            
                18.10
             |               
            
                18.00
             |                           
            
                18.00
             | 
            
                18.00
             |                     
            
                18.00
             |                                 
            
                101,350
             |            
            
                 
             |                                       
         
    
        
            | 
                5/6/2011
             | 
            
                +0.20 / +1.12%
             |             
            
                17.80
             |           
            
                18.10
             |               
            
                17.80
             |                           
            
                18.10
             | 
            
                18.10
             |                     
            
                18.10
             |                                 
            
                110,360
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/5/2011
             | 
            
                -0.30 / -1.65%
             |             
            
                18.10
             |           
            
                18.10
             |               
            
                17.90
             |                           
            
                17.90
             | 
            
                17.90
             |                     
            
                17.90
             |                                 
            
                106,390
             |            
            
                 
             |                                       
         
    
        
            | 
                5/4/2011
             | 
            
                -0.10 / -0.55%
             |             
            
                18.00
             |           
            
                18.20
             |               
            
                18.00
             |                           
            
                18.20
             | 
            
                18.20
             |                     
            
                18.20
             |                                 
            
                135,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/29/2011
             | 
            
                0.00 / 0.00%
             |             
            
                18.40
             |           
            
                18.40
             |               
            
                18.00
             |                           
            
                18.30
             | 
            
                18.30
             |                     
            
                18.30
             |                                 
            
                93,960
             |            
            
                 
             |                                       
         
    
        
            | 
                4/28/2011
             | 
            
                0.00 / 0.00%
             |             
            
                18.30
             |           
            
                18.50
             |               
            
                18.00
             |                           
            
                18.30
             | 
            
                18.30
             |                     
            
                18.30
             |                                 
            
                73,880
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/27/2011
             | 
            
                +0.20 / +1.10%
             |             
            
                18.20
             |           
            
                18.30
             |               
            
                18.00
             |                           
            
                18.30
             | 
            
                18.30
             |                     
            
                18.30
             |                                 
            
                180,220
             |            
            
                 
             |                                       
         
    
        
            | 
                4/26/2011
             | 
            
                -0.30 / -1.63%
             |             
            
                18.40
             |           
            
                18.40
             |               
            
                18.00
             |                           
            
                18.10
             | 
            
                18.10
             |                     
            
                18.10
             |                                 
            
                131,850
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/25/2011
             | 
            
                +0.40 / +2.22%
             |             
            
                18.00
             |           
            
                18.40
             |               
            
                18.00
             |                           
            
                18.40
             | 
            
                18.40
             |                     
            
                18.40
             |                                 
            
                145,620
             |            
            
                 
             |                                       
         
    
        
            | 
                4/22/2011
             | 
            
                0.00 / 0.00%
             |             
            
                18.00
             |           
            
                18.10
             |               
            
                17.70
             |                           
            
                18.00
             | 
            
                18.00
             |                     
            
                18.00
             |                                 
            
                177,640
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/21/2011
             | 
            
                -0.10 / -0.55%
             |             
            
                18.20
             |           
            
                18.20
             |               
            
                17.80
             |                           
            
                18.00
             | 
            
                18.00
             |                     
            
                18.00
             |                                 
            
                186,990
             |            
            
                 
             |                                       
         
    
        
            | 
                4/20/2011
             | 
            
                +0.10 / +0.56%
             |             
            
                18.00
             |           
            
                18.10
             |               
            
                17.90
             |                           
            
                18.10
             | 
            
                18.10
             |                     
            
                18.10
             |                                 
            
                195,080
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/19/2011
             | 
            
                0.00 / 0.00%
             |             
            
                18.00
             |           
            
                18.10
             |               
            
                17.90
             |                           
            
                18.00
             | 
            
                18.00
             |                     
            
                18.00
             |                                 
            
                129,330
             |            
            
                 
             |                                       
         
    
        
            | 
                4/18/2011
             | 
            
                -0.50 / -2.70%
             |             
            
                18.50
             |           
            
                18.50
             |               
            
                18.00
             |                           
            
                18.00
             | 
            
                18.00
             |                     
            
                18.00
             |                                 
            
                130,920
             |  
            
                 
             |                                                              
             
    
         
    
    
 |