| 
                 
                    Closing price on 10/6/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    7.10 | 
                 
                
                    | High | 
                    7.50 | 
                 
                
                    | Low | 
                    7.10 | 
                     
                
                    | Volume | 
                    3,520 | 
                                 
                
                    | Split-adjusted Price | 
                    3.24 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
MDG Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                10/6/2011
             | 
            
                +0.10 / +1.37%
             |             
            
                7.10
             |           
            
                7.50
             |               
            
                7.10
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                3.24
             |                                 
            
                3,520
             |            
            
                 
             |                                       
         
    
        
            | 
                10/5/2011
             | 
            
                -0.10 / -1.35%
             |             
            
                7.60
             |           
            
                7.60
             |               
            
                7.30
             |                           
            
                7.30
             | 
            
                7.30
             |                     
            
                3.19
             |                                 
            
                36,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/4/2011
             | 
            
                0.00 / 0.00%
             |             
            
                7.50
             |           
            
                7.50
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                3.24
             |                                 
            
                26,210
             |            
            
                 
             |                                       
         
    
        
            | 
                10/3/2011
             | 
            
                -0.20 / -2.63%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                3.24
             |                                 
            
                12,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/30/2011
             | 
            
                +0.10 / +1.33%
             |             
            
                7.40
             |           
            
                7.60
             |               
            
                7.40
             |                           
            
                7.60
             | 
            
                7.60
             |                     
            
                3.33
             |                                 
            
                10,370
             |            
            
                 
             |                                       
         
    
        
            | 
                9/29/2011
             | 
            
                -0.10 / -1.32%
             |             
            
                7.50
             |           
            
                7.60
             |               
            
                7.50
             |                           
            
                7.50
             | 
            
                7.50
             |                     
            
                3.28
             |                                 
            
                36,370
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/28/2011
             | 
            
                +0.20 / +2.70%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.40
             |                           
            
                7.60
             | 
            
                7.60
             |                     
            
                3.33
             |                                 
            
                56,780
             |            
            
                 
             |                                       
         
    
        
            | 
                9/27/2011
             | 
            
                0.00 / 0.00%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.30
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                3.24
             |                                 
            
                22,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/26/2011
             | 
            
                -0.10 / -1.33%
             |             
            
                7.40
             |           
            
                7.70
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                3.24
             |                                 
            
                14,020
             |            
            
                 
             |                                       
         
    
        
            | 
                9/23/2011
             | 
            
                +0.30 / +4.17%
             |             
            
                7.50
             |           
            
                7.50
             |               
            
                7.40
             |                           
            
                7.50
             | 
            
                7.50
             |                     
            
                3.28
             |                                 
            
                69,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/22/2011
             | 
            
                +0.30 / +4.35%
             |             
            
                7.10
             |           
            
                7.20
             |               
            
                7.10
             |                           
            
                7.20
             | 
            
                7.20
             |                     
            
                3.15
             |                                 
            
                9,090
             |            
            
                 
             |                                       
         
    
        
            | 
                9/21/2011
             | 
            
                -0.30 / -4.17%
             |             
            
                7.30
             |           
            
                7.30
             |               
            
                6.90
             |                           
            
                6.90
             | 
            
                6.90
             |                     
            
                3.02
             |                                 
            
                47,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/20/2011
             | 
            
                -0.10 / -1.37%
             |             
            
                7.50
             |           
            
                7.50
             |               
            
                7.00
             |                           
            
                7.20
             | 
            
                7.20
             |                     
            
                3.15
             |                                 
            
                16,520
             |            
            
                 
             |                                       
         
    
        
            | 
                9/19/2011
             | 
            
                0.00 / 0.00%
             |             
            
                7.20
             |           
            
                7.40
             |               
            
                7.20
             |                           
            
                7.30
             | 
            
                7.30
             |                     
            
                3.19
             |                                 
            
                29,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/16/2011
             | 
            
                +0.10 / +1.39%
             |             
            
                7.20
             |           
            
                7.40
             |               
            
                6.90
             |                           
            
                7.30
             | 
            
                7.30
             |                     
            
                3.19
             |                                 
            
                45,550
             |            
            
                 
             |                                       
         
    
        
            | 
                9/15/2011
             | 
            
                -0.30 / -4.00%
             |             
            
                7.80
             |           
            
                7.80
             |               
            
                7.20
             |                           
            
                7.20
             | 
            
                7.20
             |                     
            
                3.15
             |                                 
            
                13,170
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/14/2011
             | 
            
                +0.10 / +1.35%
             |             
            
                7.40
             |           
            
                7.50
             |               
            
                7.10
             |                           
            
                7.50
             | 
            
                7.50
             |                     
            
                3.28
             |                                 
            
                14,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/13/2011
             | 
            
                +0.20 / +2.78%
             |             
            
                7.40
             |           
            
                7.50
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                3.24
             |                                 
            
                62,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/12/2011
             | 
            
                -0.20 / -2.70%
             |             
            
                7.10
             |           
            
                7.40
             |               
            
                7.10
             |                           
            
                7.20
             | 
            
                7.20
             |                     
            
                3.15
             |                                 
            
                3,380
             |            
            
                 
             |                                       
         
    
        
            | 
                9/9/2011
             | 
            
                +0.20 / +2.78%
             |             
            
                7.40
             |           
            
                7.50
             |               
            
                7.20
             |                           
            
                7.40
             | 
            
                7.40
             |                     
            
                3.24
             |                                 
            
                59,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/8/2011
             | 
            
                +0.30 / +4.35%
             |             
            
                7.20
             |           
            
                7.20
             |               
            
                7.10
             |                           
            
                7.20
             | 
            
                7.20
             |                     
            
                3.15
             |                                 
            
                35,030
             |            
            
                 
             |                                       
         
    
        
            | 
                9/7/2011
             | 
            
                +0.30 / +4.55%
             |             
            
                6.90
             |           
            
                6.90
             |               
            
                6.80
             |                           
            
                6.90
             | 
            
                6.90
             |                     
            
                3.02
             |                                 
            
                85,290
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/6/2011
             | 
            
                -0.30 / -4.35%
             |             
            
                6.80
             |           
            
                6.80
             |               
            
                6.60
             |                           
            
                6.60
             | 
            
                6.60
             |                     
            
                2.89
             |                                 
            
                3,900
             |            
            
                 
             |                                       
         
    
        
            | 
                9/5/2011
             | 
            
                -0.10 / -1.43%
             |             
            
                7.00
             |           
            
                7.00
             |               
            
                6.90
             |                           
            
                6.90
             | 
            
                6.90
             |                     
            
                3.02
             |                                 
            
                81,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/1/2011
             | 
            
                -0.10 / -1.41%
             |             
            
                7.10
             |           
            
                7.10
             |               
            
                7.00
             |                           
            
                7.00
             | 
            
                7.00
             |                     
            
                3.06
             |                                 
            
                105,720
             |            
            
                 
             |                                       
         
    
        
            | 
                8/31/2011
             | 
            
                +0.10 / +1.43%
             |             
            
                7.00
             |           
            
                7.10
             |               
            
                6.90
             |                           
            
                7.10
             | 
            
                7.10
             |                     
            
                3.11
             |                                 
            
                3,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/30/2011
             | 
            
                0.00 / 0.00%
             |             
            
                7.30
             |           
            
                7.30
             |               
            
                6.90
             |                           
            
                7.00
             | 
            
                7.00
             |                     
            
                3.06
             |                                 
            
                102,530
             |            
            
                 
             |                                       
         
    
        
            | 
                8/29/2011
             | 
            
                +0.30 / +4.48%
             |             
            
                7.00
             |           
            
                7.00
             |               
            
                6.40
             |                           
            
                7.00
             | 
            
                7.00
             |                     
            
                3.06
             |                                 
            
                8,590
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/26/2011
             | 
            
                +0.10 / +1.52%
             |             
            
                6.40
             |           
            
                6.90
             |               
            
                6.40
             |                           
            
                6.70
             | 
            
                6.70
             |                     
            
                2.93
             |                                 
            
                2,230
             |            
            
                 
             |                                       
         
    
        
            | 
                8/25/2011
             | 
            
                -0.30 / -4.35%
             |             
            
                6.70
             |           
            
                6.70
             |               
            
                6.60
             |                           
            
                6.60
             | 
            
                6.60
             |                     
            
                2.89
             |                                 
            
                10,990
             |  
            
                 
             |                                                              
             
    
         
    
    
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