????????(OECD)? 11? ‘???? ?? ??’ ????? ??? ??????? ??? 2011? 72.5%?? 2060? 52.3%? ??? ???? ????. ?? ??? OECD 34? ??? ? 8? ?? ???? ? ?? ? ?????. ??? 2031～2060? ??? ?????? ??? ??(PPP)?? 1.0%?, ?????(0.6%)? ?? ? ??? ?? ???? OECD? ????.
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