| 
                 
                    Closing price on 5/11/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    12.30 | 
                 
                
                    | High | 
                    12.30 | 
                 
                
                    | Low | 
                    12.20 | 
                     
                
                    | Volume | 
                    5,890 | 
                                 
                
                    | Split-adjusted Price | 
                    5.34 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
MDG Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/11/2011
             | 
            
                -0.20 / -1.61%
             |             
            
                12.30
             |           
            
                12.30
             |               
            
                12.20
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                5.34
             |                                 
            
                5,890
             |            
            
                 
             |                                       
         
    
        
            | 
                5/10/2011
             | 
            
                +0.20 / +1.64%
             |             
            
                12.20
             |           
            
                12.40
             |               
            
                12.20
             |                           
            
                12.40
             | 
            
                12.40
             |                     
            
                5.43
             |                                 
            
                12,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/9/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.10
             |           
            
                12.20
             |               
            
                12.10
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                5.34
             |                                 
            
                23,550
             |            
            
                 
             |                                       
         
    
        
            | 
                5/6/2011
             | 
            
                -0.30 / -2.40%
             |             
            
                12.70
             |           
            
                12.70
             |               
            
                12.10
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                5.34
             |                                 
            
                16,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/5/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.40
             |           
            
                12.50
             |               
            
                12.30
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                5.47
             |                                 
            
                27,010
             |            
            
                 
             |                                       
         
    
        
            | 
                5/4/2011
             | 
            
                +0.30 / +2.46%
             |             
            
                12.30
             |           
            
                12.60
             |               
            
                12.30
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                5.47
             |                                 
            
                93,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/29/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.20
             |           
            
                12.30
             |               
            
                12.20
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                5.34
             |                                 
            
                46,360
             |            
            
                 
             |                                       
         
    
        
            | 
                4/28/2011
             | 
            
                +0.20 / +1.67%
             |             
            
                12.00
             |           
            
                12.20
             |               
            
                12.00
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                5.34
             |                                 
            
                110,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/27/2011
             | 
            
                -0.10 / -0.83%
             |             
            
                12.10
             |           
            
                12.50
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                5.25
             |                                 
            
                63,900
             |            
            
                 
             |                                       
         
    
        
            | 
                4/26/2011
             | 
            
                -0.60 / -4.72%
             |             
            
                12.70
             |           
            
                12.70
             |               
            
                12.10
             |                           
            
                12.10
             | 
            
                12.10
             |                     
            
                5.30
             |                                 
            
                52,750
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/25/2011
             | 
            
                +0.50 / +4.10%
             |             
            
                12.50
             |           
            
                12.70
             |               
            
                12.20
             |                           
            
                12.70
             | 
            
                12.70
             |                     
            
                5.56
             |                                 
            
                94,530
             |            
            
                 
             |                                       
         
    
        
            | 
                4/22/2011
             | 
            
                -0.10 / -0.81%
             |             
            
                12.40
             |           
            
                12.40
             |               
            
                12.00
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                5.34
             |                                 
            
                24,520
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/21/2011
             | 
            
                +0.30 / +2.50%
             |             
            
                12.00
             |           
            
                12.30
             |               
            
                12.00
             |                           
            
                12.30
             | 
            
                12.30
             |                     
            
                5.38
             |                                 
            
                61,030
             |            
            
                 
             |                                       
         
    
        
            | 
                4/20/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.50
             |           
            
                12.50
             |               
            
                11.90
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                5.25
             |                                 
            
                85,660
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/19/2011
             | 
            
                -0.60 / -4.76%
             |             
            
                12.50
             |           
            
                12.90
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                5.25
             |                                 
            
                99,470
             |            
            
                 
             |                                       
         
    
        
            | 
                4/18/2011
             | 
            
                -0.30 / -2.33%
             |             
            
                12.80
             |           
            
                13.00
             |               
            
                12.40
             |                           
            
                12.60
             | 
            
                12.60
             |                     
            
                5.51
             |                                 
            
                88,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/15/2011
             | 
            
                -0.50 / -3.73%
             |             
            
                13.30
             |           
            
                13.60
             |               
            
                12.90
             |                           
            
                12.90
             | 
            
                12.90
             |                     
            
                5.65
             |                                 
            
                71,840
             |            
            
                 
             |                                       
         
    
        
            | 
                4/14/2011
             | 
            
                0.00 / 0.00%
             |             
            
                13.30
             |           
            
                13.50
             |               
            
                13.20
             |                           
            
                13.40
             | 
            
                13.40
             |                     
            
                5.86
             |                                 
            
                53,360
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/13/2011
             | 
            
                0.00 / 0.00%
             |             
            
                13.40
             |           
            
                13.50
             |               
            
                13.20
             |                           
            
                13.40
             | 
            
                13.40
             |                     
            
                5.86
             |                                 
            
                58,040
             |            
            
                 
             |                                       
         
    
        
            | 
                4/8/2011
             | 
            
                +0.10 / +0.75%
             |             
            
                13.50
             |           
            
                13.70
             |               
            
                13.40
             |                           
            
                13.40
             | 
            
                13.40
             |                     
            
                5.86
             |                                 
            
                47,860
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/7/2011
             | 
            
                -0.70 / -5.00%
             |             
            
                14.00
             |           
            
                14.00
             |               
            
                13.30
             |                           
            
                13.30
             | 
            
                13.30
             |                     
            
                5.82
             |                                 
            
                106,690
             |            
            
                 
             |                                       
         
    
        
            | 
                4/6/2011
             | 
            
                +0.30 / +2.19%
             |             
            
                13.70
             |           
            
                14.10
             |               
            
                13.60
             |                           
            
                14.00
             | 
            
                14.00
             |                     
            
                6.13
             |                                 
            
                37,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/5/2011
             | 
            
                +0.10 / +0.74%
             |             
            
                13.40
             |           
            
                13.80
             |               
            
                13.10
             |                           
            
                13.70
             | 
            
                13.70
             |                     
            
                6.00
             |                                 
            
                27,010
             |            
            
                 
             |                                       
         
    
        
            | 
                4/4/2011
             | 
            
                -0.70 / -4.90%
             |             
            
                14.10
             |           
            
                14.20
             |               
            
                13.60
             |                           
            
                13.60
             | 
            
                13.60
             |                     
            
                5.95
             |                                 
            
                32,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/1/2011
             | 
            
                +0.50 / +3.62%
             |             
            
                13.80
             |           
            
                14.40
             |               
            
                13.80
             |                           
            
                14.30
             | 
            
                14.30
             |                     
            
                6.26
             |                                 
            
                128,530
             |            
            
                 
             |                                       
         
    
        
            | 
                3/31/2011
             | 
            
                +0.60 / +4.55%
             |             
            
                13.30
             |           
            
                13.80
             |               
            
                13.20
             |                           
            
                13.80
             | 
            
                13.80
             |                     
            
                6.04
             |                                 
            
                116,640
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/30/2011
             | 
            
                +0.40 / +3.13%
             |             
            
                12.70
             |           
            
                13.40
             |               
            
                12.70
             |                           
            
                13.20
             | 
            
                13.20
             |                     
            
                5.78
             |                                 
            
                53,680
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2011
             | 
            
                -0.20 / -1.54%
             |             
            
                13.40
             |           
            
                13.40
             |               
            
                12.80
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                5.60
             |                                 
            
                21,880
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/28/2011
             | 
            
                -0.50 / -3.70%
             |             
            
                13.20
             |           
            
                13.70
             |               
            
                13.00
             |                           
            
                13.00
             | 
            
                13.00
             |                     
            
                5.69
             |                                 
            
                49,900
             |            
            
                 
             |                                       
         
    
        
            | 
                3/25/2011
             | 
            
                -0.30 / -2.17%
             |             
            
                13.60
             |           
            
                13.90
             |               
            
                13.20
             |                           
            
                13.50
             | 
            
                13.50
             |                     
            
                5.91
             |                                 
            
                51,260
             |  
            
                 
             |                                                              
             
    
         
    
    
 |