| 
                 
                    Closing price on 2/28/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    18.50 | 
                 
                
                    | High | 
                    18.90 | 
                 
                
                    | Low | 
                    18.50 | 
                     
                
                    | Volume | 
                    1,220 | 
                                 
                
                    | Split-adjusted Price | 
                    2.45 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
ACC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                2/28/2012
             | 
            
                +0.40 / +2.16%
             |             
            
                18.50
             |           
            
                18.90
             |               
            
                18.50
             |                           
            
                18.90
             | 
            
                18.90
             |                     
            
                2.45
             |                                 
            
                1,220
             |            
            
                 
             |                                       
         
    
        
            | 
                2/27/2012
             | 
            
                -0.50 / -2.63%
             |             
            
                18.10
             |           
            
                18.50
             |               
            
                18.10
             |                           
            
                18.50
             | 
            
                18.50
             |                     
            
                2.40
             |                                 
            
                20,850
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/24/2012
             | 
            
                +0.60 / +3.26%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                18.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                2.46
             |                                 
            
                5,280
             |            
            
                 
             |                                       
         
    
        
            | 
                2/23/2012
             | 
            
                0.00 / 0.00%
             |             
            
                18.50
             |           
            
                18.50
             |               
            
                18.30
             |                           
            
                18.40
             | 
            
                18.40
             |                     
            
                2.38
             |                                 
            
                1,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/22/2012
             | 
            
                +0.80 / +4.55%
             |             
            
                18.40
             |           
            
                18.40
             |               
            
                18.40
             |                           
            
                18.40
             | 
            
                18.40
             |                     
            
                2.38
             |                                 
            
                10
             |            
            
                 
             |                                       
         
    
        
            | 
                2/21/2012
             | 
            
                0.00 / 0.00%
             |             
            
                17.50
             |           
            
                17.60
             |               
            
                17.50
             |                           
            
                17.60
             | 
            
                17.60
             |                     
            
                2.28
             |                                 
            
                3,220
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/20/2012
             | 
            
                -0.10 / -0.56%
             |             
            
                17.70
             |           
            
                17.70
             |               
            
                17.60
             |                           
            
                17.60
             | 
            
                17.60
             |                     
            
                2.28
             |                                 
            
                1,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/17/2012
             | 
            
                +0.80 / +4.73%
             |             
            
                16.90
             |           
            
                17.70
             |               
            
                16.90
             |                           
            
                17.70
             | 
            
                17.70
             |                     
            
                2.29
             |                                 
            
                590
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/16/2012
             | 
            
                +0.10 / +0.60%
             |             
            
                17.30
             |           
            
                17.30
             |               
            
                16.90
             |                           
            
                16.90
             | 
            
                16.90
             |                     
            
                2.19
             |                                 
            
                1,330
             |            
            
                 
             |                                       
         
    
        
            | 
                2/15/2012
             | 
            
                +0.10 / +0.60%
             |             
            
                16.80
             |           
            
                16.80
             |               
            
                16.80
             |                           
            
                16.80
             | 
            
                16.80
             |                     
            
                2.18
             |                                 
            
                560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/14/2012
             | 
            
                -0.30 / -1.76%
             |             
            
                17.00
             |           
            
                17.80
             |               
            
                16.70
             |                           
            
                16.70
             | 
            
                16.70
             |                     
            
                2.16
             |                                 
            
                120
             |            
            
                 
             |                                       
         
    
        
            | 
                2/13/2012
             | 
            
                -0.80 / -4.49%
             |             
            
                17.00
             |           
            
                17.00
             |               
            
                17.00
             |                           
            
                17.00
             | 
            
                17.00
             |                     
            
                2.20
             |                                 
            
                200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/10/2012
             | 
            
                -0.90 / -4.81%
             |             
            
                19.60
             |           
            
                19.60
             |               
            
                17.80
             |                           
            
                17.80
             | 
            
                17.80
             |                     
            
                2.31
             |                                 
            
                20
             |            
            
                 
             |                                       
         
    
        
            | 
                2/9/2012
             | 
            
                -0.80 / -4.10%
             |             
            
                18.80
             |           
            
                18.80
             |               
            
                18.60
             |                           
            
                18.70
             | 
            
                18.70
             |                     
            
                2.42
             |                                 
            
                1,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/8/2012
             | 
            
                -1.00 / -4.88%
             |             
            
                20.00
             |           
            
                20.00
             |               
            
                19.50
             |                           
            
                19.50
             | 
            
                19.50
             |                     
            
                2.53
             |                                 
            
                110
             |            
            
                 
             |                                       
         
    
        
            | 
                2/7/2012
             | 
            
                0.00 / 0.00%
             |             
            
                20.50
             |           
            
                20.50
             |               
            
                20.50
             |                           
            
                20.50
             | 
            
                20.50
             |                     
            
                2.66
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                20.50
             |           
            
                20.50
             |               
            
                20.50
             |                           
            
                20.50
             | 
            
                20.50
             |                     
            
                2.66
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                2/3/2012
             | 
            
                0.00 / 0.00%
             |             
            
                20.50
             |           
            
                20.50
             |               
            
                20.50
             |                           
            
                20.50
             | 
            
                20.50
             |                     
            
                2.66
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/2/2012
             | 
            
                0.00 / 0.00%
             |             
            
                20.50
             |           
            
                20.50
             |               
            
                20.50
             |                           
            
                20.50
             | 
            
                20.50
             |                     
            
                2.66
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                2/1/2012
             | 
            
                +0.60 / +3.02%
             |             
            
                20.50
             |           
            
                20.50
             |               
            
                20.40
             |                           
            
                20.50
             | 
            
                20.50
             |                     
            
                2.66
             |                                 
            
                110
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/31/2012
             | 
            
                0.00 / 0.00%
             |             
            
                19.90
             |           
            
                19.90
             |               
            
                19.90
             |                           
            
                19.90
             | 
            
                19.90
             |                     
            
                2.58
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                1/30/2012
             | 
            
                0.00 / 0.00%
             |             
            
                19.90
             |           
            
                19.90
             |               
            
                19.90
             |                           
            
                19.90
             | 
            
                19.90
             |                     
            
                2.58
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/20/2012
             | 
            
                +0.40 / +2.05%
             |             
            
                19.90
             |           
            
                19.90
             |               
            
                19.90
             |                           
            
                19.90
             | 
            
                19.90
             |                     
            
                2.58
             |                                 
            
                40
             |            
            
                 
             |                                       
         
    
        
            | 
                1/19/2012
             | 
            
                +0.40 / +2.09%
             |             
            
                19.50
             |           
            
                19.50
             |               
            
                19.50
             |                           
            
                19.50
             | 
            
                19.50
             |                     
            
                2.53
             |                                 
            
                10
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/18/2012
             | 
            
                0.00 / 0.00%
             |             
            
                19.10
             |           
            
                19.10
             |               
            
                19.10
             |                           
            
                19.10
             | 
            
                19.10
             |                     
            
                2.47
             |                                 
            
                360
             |            
            
                 
             |                                       
         
    
        
            | 
                1/17/2012
             | 
            
                +0.10 / +0.53%
             |             
            
                19.00
             |           
            
                19.10
             |               
            
                19.00
             |                           
            
                19.10
             | 
            
                19.10
             |                     
            
                2.47
             |                                 
            
                4,830
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/16/2012
             | 
            
                +0.30 / +1.60%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                2.46
             |                                 
            
                10
             |            
            
                 
             |                                       
         
    
        
            | 
                1/13/2012
             | 
            
                +0.50 / +2.75%
             |             
            
                18.80
             |           
            
                18.80
             |               
            
                18.00
             |                           
            
                18.70
             | 
            
                18.70
             |                     
            
                2.42
             |                                 
            
                430
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/12/2012
             | 
            
                +0.20 / +1.11%
             |             
            
                18.20
             |           
            
                18.20
             |               
            
                18.20
             |                           
            
                18.20
             | 
            
                18.20
             |                     
            
                2.36
             |                                 
            
                30
             |            
            
                 
             |                                       
         
    
        
            | 
                1/11/2012
             | 
            
                0.00 / 0.00%
             |             
            
                18.00
             |           
            
                18.00
             |               
            
                18.00
             |                           
            
                18.00
             | 
            
                18.00
             |                     
            
                2.33
             |                                 
            
                4,780
             |  
            
                 
             |                                                              
             
    
         
    
    
 |