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

?????1971?????,???,???????????????????????20??????90?,????????,????????

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?:??????????????????????

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????:1?????????:????????100?????

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3????????

4?????1000?????

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?????1971?????,???,???????????????????????20??????90?,????????,????????

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?????,???????15.55???,??????????487??????????????????????????????????????????,2010???2023????????????????,????????????????????????????455????????????,??2384???2017??????????????,???,???????????2023??,?76%?????????????,??91%?

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