?? ???????????????????5.1%
????:1??????:??????????
2???sn??
3??????????
4?????????
5???????
???????????10??14??????????????????? (????? ??????????????)?14????????????????????,?4.62???????????????,???????????????????5.1%?
??????????,???????????????????,????????????????????????????8.6%?13.4%;???????????????????14.4%?34.3%?????,???????????????????????????????????????????????
??????,???????????????????????????,??????????????????,?????????,???,??????
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