| 
             Contract 
             | 
            
             Open 
             | 
            
             High 
             | 
            
             Low 
             | 
            
             Close 
             | 
            
             Change 
             | 
            
             Volume  
             | 
            
             Open Int. 
             | 
        
| 
             Apr '11(CHCJ) 
             | 
            4.2845 | 4.33 | 4.28 | 4.3185 | 0.0175 | 267 | 213 | 
| 
             May '11(CHCK) 
             | 
            4.3015 | 4.3415 | 4.2515 | 4.319 | 0.016 | 30560 | 22642 | 
| 
             June '11(CHCM) 
             | 
            4.319 | 4.351 | 4.2665 | 4.33 | 0.016 | 1263 | 2791 | 
| 
             July '11(CHCN) 
             | 
            4.3125 | 4.3615 | 4.2725 | 4.3395 | 0.016 | 20799 | 71488 | 
| 
             Aug '11(CHCQ) 
             | 
            4.335 | 4.3545 | 4.335 | 4.3475 | 0.016 | 18 | 535 | 
| 
             Sep '11(CHCU) 
             | 
            4.301 | 4.3755 | 4.2885 | 4.3545 | 0.016 | 564 | 22260 | 
| 
             Oct‘/11(CHCV) 
             | 
            4.306 | 4.363 | 4.306 | 4.3605 | 0.0165 | 12 | 293 | 
| 
             Nov '11 (CHCX) 
             | 
            4.369 | 4.369 | 4.369 | 4.3645 | 0.0165 | 5 | 197 | 
| 
             Dec'11(CHCZ) 
             | 
            4.3035 | 4.38 | 4.3035 | 4.366 | 0.017 | 106 | 8384 | 
| 
             Jan‘12(CHCF) 
             | 
            4.3705 | 4.3705 | 4.3705 | 4.3705 | 0.017 | - | 74 | 
| 
             Feb '12(CHCG) 
             | 
            4.37 | 4.37 | 4.37 | 4.37 | 0.0165 | - | 31 | 
| 
             Mar '12(CHCH) 
             | 
            4.37 | 4.37 | 4.37 | 4.37 | 0.0165 | 22 | 2555 | 
