| 
                 
                    Closing price on 4/1/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    13.80 | 
                 
                
                    | High | 
                    14.40 | 
                 
                
                    | Low | 
                    13.80 | 
                     
                
                    | Volume | 
                    128,530 | 
                                 
                
                    | Split-adjusted Price | 
                    6.26 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
MDG Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                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
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/24/2011
             | 
            
                +0.10 / +0.73%
             |             
            
                13.60
             |           
            
                14.30
             |               
            
                13.60
             |                           
            
                13.80
             | 
            
                13.80
             |                     
            
                6.04
             |                                 
            
                50,030
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2011
             | 
            
                +0.60 / +4.58%
             |             
            
                13.70
             |           
            
                13.70
             |               
            
                13.30
             |                           
            
                13.70
             | 
            
                13.70
             |                     
            
                6.00
             |                                 
            
                78,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/22/2011
             | 
            
                +0.60 / +4.80%
             |             
            
                12.40
             |           
            
                13.10
             |               
            
                12.40
             |                           
            
                13.10
             | 
            
                13.10
             |                     
            
                5.73
             |                                 
            
                102,560
             |            
            
                 
             |                                       
         
    
        
            | 
                3/21/2011
             | 
            
                -0.30 / -2.34%
             |             
            
                12.80
             |           
            
                12.80
             |               
            
                12.50
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                5.47
             |                                 
            
                26,230
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/18/2011
             | 
            
                +0.30 / +2.40%
             |             
            
                12.20
             |           
            
                12.80
             |               
            
                12.20
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                5.60
             |                                 
            
                5,520
             |            
            
                 
             |                                       
         
    
        
            | 
                3/17/2011
             | 
            
                +0.50 / +4.17%
             |             
            
                12.20
             |           
            
                12.60
             |               
            
                12.20
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                5.47
             |                                 
            
                2,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                5.25
             |                                 
            
                7,740
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2011
             | 
            
                -0.20 / -1.64%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                12.00
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                5.25
             |                                 
            
                6,330
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/14/2011
             | 
            
                -0.60 / -4.69%
             |             
            
                12.40
             |           
            
                12.40
             |               
            
                12.20
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                5.34
             |                                 
            
                13,010
             |            
            
                 
             |                                       
         
    
        
            | 
                3/11/2011
             | 
            
                +0.50 / +4.07%
             |             
            
                12.40
             |           
            
                12.80
             |               
            
                12.30
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                5.60
             |                                 
            
                23,080
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/10/2011
             | 
            
                +0.50 / +4.24%
             |             
            
                11.90
             |           
            
                12.30
             |               
            
                11.90
             |                           
            
                12.30
             | 
            
                12.30
             |                     
            
                5.38
             |                                 
            
                4,090
             |            
            
                 
             |                                       
         
    
        
            | 
                3/9/2011
             | 
            
                -0.10 / -0.84%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                11.70
             |                           
            
                11.80
             | 
            
                11.80
             |                     
            
                5.16
             |                                 
            
                7,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/8/2011
             | 
            
                -0.10 / -0.83%
             |             
            
                11.70
             |           
            
                12.10
             |               
            
                11.70
             |                           
            
                11.90
             | 
            
                11.90
             |                     
            
                5.21
             |                                 
            
                31,170
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.00
             |           
            
                12.00
             |               
            
                11.80
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                5.25
             |                                 
            
                34,520
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/4/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.50
             |           
            
                12.50
             |               
            
                11.80
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                5.25
             |                                 
            
                22,370
             |            
            
                 
             |                                       
         
    
        
            | 
                3/3/2011
             | 
            
                -0.20 / -1.64%
             |             
            
                11.90
             |           
            
                12.50
             |               
            
                11.80
             |                           
            
                12.00
             | 
            
                12.00
             |                     
            
                5.25
             |                                 
            
                32,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/2/2011
             | 
            
                -0.60 / -4.69%
             |             
            
                12.60
             |           
            
                12.60
             |               
            
                12.20
             |                           
            
                12.20
             | 
            
                12.20
             |                     
            
                5.34
             |                                 
            
                78,300
             |            
            
                 
             |                                       
         
    
        
            | 
                3/1/2011
             | 
            
                -0.10 / -0.78%
             |             
            
                13.00
             |           
            
                13.00
             |               
            
                12.40
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                5.60
             |                                 
            
                42,050
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/28/2011
             | 
            
                -0.10 / -0.77%
             |             
            
                13.40
             |           
            
                13.40
             |               
            
                12.80
             |                           
            
                12.90
             | 
            
                12.90
             |                     
            
                5.65
             |                                 
            
                2,920
             |            
            
                 
             |                                       
         
    
        
            | 
                2/25/2011
             | 
            
                +0.60 / +4.84%
             |             
            
                12.90
             |           
            
                13.00
             |               
            
                12.80
             |                           
            
                13.00
             | 
            
                13.00
             |                     
            
                5.69
             |                                 
            
                29,350
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/24/2011
             | 
            
                -0.50 / -3.88%
             |             
            
                13.20
             |           
            
                13.20
             |               
            
                12.30
             |                           
            
                12.40
             | 
            
                12.40
             |                     
            
                5.43
             |                                 
            
                28,640
             |            
            
                 
             |                                       
         
    
        
            | 
                2/23/2011
             | 
            
                -0.50 / -3.73%
             |             
            
                12.80
             |           
            
                13.30
             |               
            
                12.80
             |                           
            
                12.90
             | 
            
                12.90
             |                     
            
                5.65
             |                                 
            
                198,470
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/22/2011
             | 
            
                -0.70 / -4.96%
             |             
            
                13.40
             |           
            
                13.40
             |               
            
                13.40
             |                           
            
                13.40
             | 
            
                13.40
             |                     
            
                5.86
             |                                 
            
                5,600
             |            
            
                 
             |                                       
         
    
        
            | 
                2/21/2011
             | 
            
                -0.70 / -4.73%
             |             
            
                14.10
             |           
            
                14.10
             |               
            
                14.10
             |                           
            
                14.10
             | 
            
                14.10
             |                     
            
                6.17
             |                                 
            
                54,630
             |  
            
                 
             |                                                              
             
    
         
    
    
 |