| 
                 
                    Closing price on 5/17/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    23.80 | 
                 
                
                    | High | 
                    24.80 | 
                 
                
                    | Low | 
                    23.80 | 
                     
                
                    | Volume | 
                    33,790 | 
                                 
                
                    | Split-adjusted Price | 
                    3.58 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
ACC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/17/2012
             | 
            
                -5.20 / -17.93%
             |             
            
                23.80
             |           
            
                24.80
             |               
            
                23.80
             |                           
            
                23.80
             | 
            
                23.80
             |                     
            
                3.58
             |                                 
            
                33,790
             |            
            
                 
             |                                       
         
    
        
            | 
                5/16/2012
             | 
            
                +0.70 / +2.47%
             |             
            
                27.00
             |           
            
                29.00
             |               
            
                26.90
             |                           
            
                29.00
             | 
            
                29.00
             |                     
            
                3.76
             |                                 
            
                117,410
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/15/2012
             | 
            
                -1.40 / -4.71%
             |             
            
                28.30
             |           
            
                28.30
             |               
            
                28.30
             |                           
            
                28.30
             | 
            
                28.30
             |                     
            
                3.67
             |                                 
            
                73,170
             |            
            
                 
             |                                       
         
    
        
            | 
                5/14/2012
             | 
            
                -1.50 / -4.81%
             |             
            
                29.70
             |           
            
                29.70
             |               
            
                29.70
             |                           
            
                29.70
             | 
            
                29.70
             |                     
            
                3.85
             |                                 
            
                21,120
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/11/2012
             | 
            
                -1.60 / -4.88%
             |             
            
                31.50
             |           
            
                31.50
             |               
            
                31.20
             |                           
            
                31.20
             | 
            
                31.20
             |                     
            
                4.04
             |                                 
            
                131,570
             |            
            
                 
             |                                       
         
    
        
            | 
                5/10/2012
             | 
            
                +1.30 / +4.13%
             |             
            
                33.00
             |           
            
                33.00
             |               
            
                32.00
             |                           
            
                32.80
             | 
            
                32.80
             |                     
            
                4.25
             |                                 
            
                179,230
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/9/2012
             | 
            
                +1.50 / +5.00%
             |             
            
                31.50
             |           
            
                31.50
             |               
            
                31.10
             |                           
            
                31.50
             | 
            
                31.50
             |                     
            
                4.08
             |                                 
            
                208,870
             |            
            
                 
             |                                       
         
    
        
            | 
                5/8/2012
             | 
            
                +1.40 / +4.90%
             |             
            
                30.00
             |           
            
                30.00
             |               
            
                30.00
             |                           
            
                30.00
             | 
            
                30.00
             |                     
            
                3.89
             |                                 
            
                195,350
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/7/2012
             | 
            
                +1.30 / +4.76%
             |             
            
                28.60
             |           
            
                28.60
             |               
            
                28.50
             |                           
            
                28.60
             | 
            
                28.60
             |                     
            
                3.71
             |                                 
            
                413,340
             |            
            
                 
             |                                       
         
    
        
            | 
                5/4/2012
             | 
            
                +1.30 / +5.00%
             |             
            
                26.00
             |           
            
                27.30
             |               
            
                26.00
             |                           
            
                27.30
             | 
            
                27.30
             |                     
            
                3.54
             |                                 
            
                56,550
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/3/2012
             | 
            
                0.00 / 0.00%
             |             
            
                25.20
             |           
            
                26.00
             |               
            
                25.00
             |                           
            
                26.00
             | 
            
                26.00
             |                     
            
                3.37
             |                                 
            
                6,930
             |            
            
                 
             |                                       
         
    
        
            | 
                5/2/2012
             | 
            
                +0.70 / +2.77%
             |             
            
                25.50
             |           
            
                26.50
             |               
            
                24.60
             |                           
            
                26.00
             | 
            
                26.00
             |                     
            
                3.37
             |                                 
            
                27,540
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/27/2012
             | 
            
                -0.20 / -0.78%
             |             
            
                24.50
             |           
            
                25.30
             |               
            
                24.50
             |                           
            
                25.30
             | 
            
                25.30
             |                     
            
                3.28
             |                                 
            
                7,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/26/2012
             | 
            
                +0.30 / +1.19%
             |             
            
                26.00
             |           
            
                26.00
             |               
            
                25.50
             |                           
            
                25.50
             | 
            
                25.50
             |                     
            
                3.30
             |                                 
            
                1,070
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/25/2012
             | 
            
                +1.20 / +5.00%
             |             
            
                25.00
             |           
            
                25.20
             |               
            
                25.00
             |                           
            
                25.20
             | 
            
                25.20
             |                     
            
                3.27
             |                                 
            
                13,070
             |            
            
                 
             |                                       
         
    
        
            | 
                4/24/2012
             | 
            
                +0.80 / +3.45%
             |             
            
                24.00
             |           
            
                24.00
             |               
            
                24.00
             |                           
            
                24.00
             | 
            
                24.00
             |                     
            
                3.11
             |                                 
            
                1,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/23/2012
             | 
            
                -0.50 / -2.11%
             |             
            
                23.00
             |           
            
                24.50
             |               
            
                22.90
             |                           
            
                23.20
             | 
            
                23.20
             |                     
            
                3.01
             |                                 
            
                11,340
             |            
            
                 
             |                                       
         
    
        
            | 
                4/20/2012
             | 
            
                -1.20 / -4.82%
             |             
            
                24.10
             |           
            
                24.90
             |               
            
                23.70
             |                           
            
                23.70
             | 
            
                23.70
             |                     
            
                3.07
             |                                 
            
                6,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/19/2012
             | 
            
                +0.90 / +3.75%
             |             
            
                24.00
             |           
            
                25.20
             |               
            
                23.00
             |                           
            
                24.90
             | 
            
                24.90
             |                     
            
                3.23
             |                                 
            
                20,650
             |            
            
                 
             |                                       
         
    
        
            | 
                4/18/2012
             | 
            
                +0.90 / +3.90%
             |             
            
                23.10
             |           
            
                24.00
             |               
            
                23.10
             |                           
            
                24.00
             | 
            
                24.00
             |                     
            
                3.11
             |                                 
            
                9,030
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/17/2012
             | 
            
                +0.20 / +0.87%
             |             
            
                23.20
             |           
            
                23.50
             |               
            
                23.00
             |                           
            
                23.10
             | 
            
                23.10
             |                     
            
                2.99
             |                                 
            
                17,100
             |            
            
                 
             |                                       
         
    
        
            | 
                4/16/2012
             | 
            
                +0.90 / +4.09%
             |             
            
                22.00
             |           
            
                23.10
             |               
            
                22.00
             |                           
            
                22.90
             | 
            
                22.90
             |                     
            
                2.97
             |                                 
            
                10,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/13/2012
             | 
            
                0.00 / 0.00%
             |             
            
                22.00
             |           
            
                22.60
             |               
            
                20.90
             |                           
            
                22.00
             | 
            
                22.00
             |                     
            
                2.85
             |                                 
            
                41,170
             |            
            
                 
             |                                       
         
    
        
            | 
                4/12/2012
             | 
            
                +0.70 / +3.29%
             |             
            
                21.50
             |           
            
                22.30
             |               
            
                21.50
             |                           
            
                22.00
             | 
            
                22.00
             |                     
            
                2.85
             |                                 
            
                54,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/11/2012
             | 
            
                +0.40 / +1.91%
             |             
            
                21.50
             |           
            
                21.50
             |               
            
                21.20
             |                           
            
                21.30
             | 
            
                21.30
             |                     
            
                2.76
             |                                 
            
                3,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/10/2012
             | 
            
                +0.60 / +2.96%
             |             
            
                21.00
             |           
            
                21.00
             |               
            
                20.90
             |                           
            
                20.90
             | 
            
                20.90
             |                     
            
                2.71
             |                                 
            
                880
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/9/2012
             | 
            
                +0.70 / +3.57%
             |             
            
                19.30
             |           
            
                20.30
             |               
            
                19.30
             |                           
            
                20.30
             | 
            
                20.30
             |                     
            
                2.63
             |                                 
            
                3,050
             |            
            
                 
             |                                       
         
    
        
            | 
                4/6/2012
             | 
            
                +0.90 / +4.81%
             |             
            
                19.50
             |           
            
                19.60
             |               
            
                19.00
             |                           
            
                19.60
             | 
            
                19.60
             |                     
            
                2.54
             |                                 
            
                12,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/5/2012
             | 
            
                -0.50 / -2.60%
             |             
            
                19.10
             |           
            
                19.60
             |               
            
                18.70
             |                           
            
                18.70
             | 
            
                18.70
             |                     
            
                2.42
             |                                 
            
                42,860
             |            
            
                 
             |                                       
         
    
        
            | 
                4/4/2012
             | 
            
                +0.20 / +1.05%
             |             
            
                19.00
             |           
            
                19.20
             |               
            
                19.00
             |                           
            
                19.20
             | 
            
                19.20
             |                     
            
                2.49
             |                                 
            
                6,200
             |  
            
                 
             |                                                              
             
    
         
    
    
 |