?? ??????:????????????????
????:1?????????:??????
2???100??3????
3??????
4??????????
5??????????
????????10?????30????????????????????????????? (????????????????????? ???????????????????????)????????,???????????????????30??,???????????????????????,??????
?????,???????????????????????????,?????????17.0%?18.8%?35.3%,???????????20.7%,???35.3%?
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