????:1???xt?88:???????

2????????????

3???800??

4???????????

5????????

???????????????????10????????9?? (??????????????????????????????? ??????)?????,??????????,??????????????????????????

???????9???,?????????????????????9??????????,??????????16.7???????????14.4,????????????????

?????????????(Alan Vallance)???:“??,???,???”

???,?????????220??,????????10?30?????????????

?????,29%?,??2004??????????????,????????????????16%????

??,??,?????????????(??????????????) ???????:?????