| 
                 
                    Closing price on 3/13/2008
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    32.00 | 
                 
                
                    | High | 
                    32.00 | 
                 
                
                    | Low | 
                    30.00 | 
                     
                
                    | Volume | 
                    18,700 | 
                                 
                
                    | Split-adjusted Price | 
                    21.93 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
XMC Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/13/2008
             | 
            
                -0.90 / -2.91%
             |             
            
                32.00
             |           
            
                32.00
             |               
            
                30.00
             |                           
            
                30.00
             | 
            
                30.25
             |                     
            
                21.93
             |                                 
            
                18,700
             |            
            
                 
             |                                       
         
    
        
            | 
                3/12/2008
             | 
            
                +0.30 / +0.98%
             |             
            
                32.00
             |           
            
                32.80
             |               
            
                30.00
             |                           
            
                30.90
             | 
            
                31.44
             |                     
            
                22.59
             |                                 
            
                8,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/11/2008
             | 
            
                -2.40 / -7.27%
             |             
            
                33.00
             |           
            
                34.20
             |               
            
                30.40
             |                           
            
                30.60
             | 
            
                31.27
             |                     
            
                22.37
             |                                 
            
                5,700
             |            
            
                 
             |                                       
         
    
        
            | 
                3/10/2008
             | 
            
                0.00 / 0.00%
             |             
            
                35.90
             |           
            
                35.90
             |               
            
                30.00
             |                           
            
                33.00
             | 
            
                33.69
             |                     
            
                24.13
             |                                 
            
                32,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/7/2008
             | 
            
                +2.60 / +8.64%
             |             
            
                32.70
             |           
            
                32.70
             |               
            
                32.70
             |                           
            
                32.70
             | 
            
                32.70
             |                     
            
                23.91
             |                                 
            
                16,900
             |            
            
                 
             |                                       
         
    
        
            | 
                3/6/2008
             | 
            
                +2.60 / +9.45%
             |             
            
                29.00
             |           
            
                30.10
             |               
            
                28.90
             |                           
            
                30.10
             | 
            
                29.84
             |                     
            
                22.01
             |                                 
            
                9,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/5/2008
             | 
            
                -1.90 / -6.46%
             |             
            
                31.00
             |           
            
                31.00
             |               
            
                26.60
             |                           
            
                27.50
             | 
            
                27.44
             |                     
            
                20.11
             |                                 
            
                27,800
             |            
            
                 
             |                                       
         
    
        
            | 
                3/4/2008
             | 
            
                -2.30 / -7.26%
             |             
            
                30.90
             |           
            
                30.90
             |               
            
                29.40
             |                           
            
                29.40
             | 
            
                29.46
             |                     
            
                21.50
             |                                 
            
                26,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/3/2008
             | 
            
                0.00 / 0.00%
             |             
            
                35.00
             |           
            
                35.00
             |               
            
                31.70
             |                           
            
                31.70
             | 
            
                32.58
             |                     
            
                23.18
             |                                 
            
                21,700
             |            
            
                 
             |                                       
         
    
        
            | 
                2/29/2008
             | 
            
                -1.20 / -3.31%
             |             
            
                35.00
             |           
            
                36.00
             |               
            
                35.00
             |                           
            
                35.00
             | 
            
                35.17
             |                     
            
                25.59
             |                                 
            
                8,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/28/2008
             | 
            
                +0.60 / +1.69%
             |             
            
                35.70
             |           
            
                36.80
             |               
            
                35.50
             |                           
            
                36.20
             | 
            
                36.16
             |                     
            
                26.47
             |                                 
            
                13,700
             |            
            
                 
             |                                       
         
    
        
            | 
                2/27/2008
             | 
            
                -0.40 / -1.11%
             |             
            
                37.20
             |           
            
                37.20
             |               
            
                35.50
             |                           
            
                35.60
             | 
            
                36.11
             |                     
            
                26.03
             |                                 
            
                16,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/26/2008
             | 
            
                0.00 / 0.00%
             |             
            
                39.30
             |           
            
                39.30
             |               
            
                35.00
             |                           
            
                36.00
             | 
            
                36.30
             |                     
            
                26.32
             |                                 
            
                16,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/25/2008
             | 
            
                0.00 / 0.00%
             |             
            
                35.10
             |           
            
                36.00
             |               
            
                35.10
             |                           
            
                36.00
             | 
            
                35.84
             |                     
            
                26.32
             |                                 
            
                16,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/22/2008
             | 
            
                +1.00 / +3.03%
             |             
            
                31.50
             |           
            
                36.80
             |               
            
                31.50
             |                           
            
                34.00
             | 
            
                32.77
             |                     
            
                24.86
             |                                 
            
                18,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/21/2008
             | 
            
                -3.00 / -8.33%
             |             
            
                38.00
             |           
            
                39.80
             |               
            
                32.60
             |                           
            
                33.00
             | 
            
                33.48
             |                     
            
                24.13
             |                                 
            
                29,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/20/2008
             | 
            
                -1.90 / -5.01%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                35.00
             |                           
            
                36.00
             | 
            
                36.16
             |                     
            
                26.32
             |                                 
            
                20,800
             |            
            
                 
             |                                       
         
    
        
            | 
                2/19/2008
             | 
            
                -1.60 / -4.05%
             |             
            
                38.00
             |           
            
                38.00
             |               
            
                37.50
             |                           
            
                37.90
             | 
            
                37.74
             |                     
            
                27.71
             |                                 
            
                15,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/18/2008
             | 
            
                0.00 / 0.00%
             |             
            
                38.00
             |           
            
                39.50
             |               
            
                36.00
             |                           
            
                39.50
             | 
            
                37.05
             |                     
            
                28.88
             |                                 
            
                13,100
             |            
            
                 
             |                                       
         
    
        
            | 
                2/15/2008
             | 
            
                -2.00 / -4.94%
             |             
            
                41.00
             |           
            
                41.00
             |               
            
                38.50
             |                           
            
                38.50
             | 
            
                38.76
             |                     
            
                28.15
             |                                 
            
                3,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/14/2008
             | 
            
                +0.70 / +1.76%
             |             
            
                40.00
             |           
            
                41.90
             |               
            
                39.00
             |                           
            
                40.50
             | 
            
                40.15
             |                     
            
                29.61
             |                                 
            
                17,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/13/2008
             | 
            
                -1.70 / -4.10%
             |             
            
                42.40
             |           
            
                43.00
             |               
            
                38.90
             |                           
            
                39.80
             | 
            
                40.40
             |                     
            
                29.10
             |                                 
            
                15,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/12/2008
             | 
            
                0.00 / 0.00%
             |             
            
                42.00
             |           
            
                42.40
             |               
            
                38.50
             |                           
            
                41.50
             | 
            
                40.62
             |                     
            
                30.34
             |                                 
            
                20,100
             |            
            
                 
             |                                       
         
    
        
            | 
                2/1/2008
             | 
            
                +1.00 / +2.60%
             |             
            
                38.00
             |           
            
                40.00
             |               
            
                37.90
             |                           
            
                39.50
             | 
            
                39.38
             |                     
            
                28.88
             |                                 
            
                9,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/31/2008
             | 
            
                -2.30 / -5.64%
             |             
            
                41.00
             |           
            
                41.00
             |               
            
                37.50
             |                           
            
                38.50
             | 
            
                38.78
             |                     
            
                28.15
             |                                 
            
                17,100
             |            
            
                 
             |                                       
         
    
        
            | 
                1/30/2008
             | 
            
                +2.80 / +7.37%
             |             
            
                40.00
             |           
            
                40.80
             |               
            
                40.00
             |                           
            
                40.80
             | 
            
                40.75
             |                     
            
                29.83
             |                                 
            
                22,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/29/2008
             | 
            
                +2.00 / +5.56%
             |             
            
                37.00
             |           
            
                38.00
             |               
            
                36.50
             |                           
            
                38.00
             | 
            
                37.13
             |                     
            
                27.78
             |                                 
            
                10,200
             |            
            
                 
             |                                       
         
    
        
            | 
                1/28/2008
             | 
            
                0.00 / 0.00%
             |             
            
                35.00
             |           
            
                36.00
             |               
            
                35.00
             |                           
            
                36.00
             | 
            
                35.62
             |                     
            
                26.32
             |                                 
            
                10,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/25/2008
             | 
            
                -0.70 / -1.90%
             |             
            
                36.20
             |           
            
                36.50
             |               
            
                36.00
             |                           
            
                36.20
             | 
            
                36.13
             |                     
            
                26.47
             |                                 
            
                14,600
             |            
            
                 
             |                                       
         
    
        
            | 
                1/24/2008
             | 
            
                +0.90 / +2.50%
             |             
            
                34.00
             |           
            
                37.90
             |               
            
                34.00
             |                           
            
                36.90
             | 
            
                36.78
             |                     
            
                26.98
             |                                 
            
                18,900
             |  
            
                 
             |                                                              
             
    
         
    
    
 |