??????????????????????????8????????8?????????,????,??2007/2008??????2003/2004???????,??6???8????????,??9?10?????????????2002?,??????????8%,?7784?????7153?????,????,?8????????????,??????????,???2008/2009????????0.9%,?2006/2007?,???40.7???/?????39.6???/??,??????2.7%?

    ??,??????????????????????????????????4????,9????????,????????8????????????????,??????????CBOT???????,????????????8?????????????????????,?????????8????????????????8????????????????,???????????????,?????????,??????????????????????????8??????????????????,?????????????????,??????,??????????????

    ?????????????????????,????????????????????????????????,???????????,?????????????????,???????????????????????????????????????????????,????,?????????
    ??,???????????????????????????????????,????????????????????,?????????????????,????????????????,??????????????,????,?????????????????????,????????????????????,?????,????????????????????,??????????,???????????????????????????????????

    ?????????,??????????????????????,?????????,?????????????

    ?????????????????????,????,???7??,??2004?,??6?????????8??????7???????2002???????,?627?????421???

    ???????????????,???????�?�??,CBOT???????8??????????????????2008?,CBOT?????7??????????????,??????8?12????????????????,8?????????????CBOT??11??????116?????1374??,??????17%?