| 
             Contract 
             | 
            
             Open 
             | 
            
             High 
             | 
            
             Low 
             | 
            
             Close 
             | 
            
             Change 
             | 
            
             Volume  
             | 
            
             Open Int. 
             | 
        
| 
             Apr '11(CHCJ) 
             | 
            4.254 | 4.26 | 4.2505 | 4.2285 | -0.09 | 108 | 275 | 
| 
             May '11(CHCK) 
             | 
            4.3225 | 4.3495 | 4.209 | 4.228 | -0.091 | 34139 | 15307 | 
| 
             June '11(CHCM) 
             | 
            4.3555 | 4.3555 | 4.222 | 4.2375 | -0.0925 | 1270 | 2821 | 
| 
             July '11(CHCN) 
             | 
            4.345 | 4.37 | 4.228 | 4.2465 | -0.093 | 28505 | 76127 | 
| 
             Aug '11(CHCQ) 
             | 
            4.33 | 4.33 | 4.266 | 4.2545 | -0.093 | 31 | 544 | 
| 
             Sep '11(CHCU) 
             | 
            4.352 | 4.352 | 4.255 | 4.262 | -0.0925 | 1399 | 22428 | 
| 
             Oct‘/11(CHCV) 
             | 
            4.3745 | 4.3745 | 4.27 | 4.2685 | -0.092 | 34 | 297 | 
| 
             Nov '11 (CHCX) 
             | 
            4.2775 | 4.2775 | 4.273 | 4.273 | -0.0915 | 23 | 202 | 
| 
             Dec'11(CHCZ) 
             | 
            4.3975 | 4.3975 | 4.2735 | 4.2745 | -0.0915 | 799 | 8861 | 
| 
             Jan‘12(CHCF) 
             | 
            4.275 | 4.279 | 4.2745 | 4.2795 | -0.091 | 73 | 74 | 
| 
             Feb '12(CHCG) 
             | 
            4.28 | 4.28 | 4.28 | 4.28 | -0.09 | 15 | 31 | 
| 
             Mar '12(CHCH) 
             | 
            4.3095 | 4.3265 | 4.3095 | 4.2805 | -0.0895 | 179 | 2764 | 
