?? ??53%??????????????
????:1?????:??????
2???92?95?
3????????????
4????????????
5???????????
???????????????(?):6?????????17??30???????,???????????,53%???????????????
??,?????????????3.31???,??????????????????“??”??????????“????????????”???“??????????”???4.8????????????,???12.8??,?????1978??????5.05%????13.84%????????????4??,?????515??????1000????????,???????????,2019??????2000??40%??????,??????????????????????????,4.5?????????????
???????,??????????“??????”,“?????????????”?????????,??,????“???????”?
??????????:??????????