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?? 1997? 3? 10? 17? 44?

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??? 10? ??? ?? ?? ???? 1?8?13?3?9??? ??? 2.1%? ???? 37?3?8???? ???? ??? ???. ??? ??? ???? ??? ???? ? ?????? 10～20%? ▲????? ??? ? ???? ?? 11?3??? ▲??? ???? ?? 3?7?8??? ▲??????(IPU) ?? ?? 2?5?8?65?? ▲?? ?????? ? ???? ???? 3?6?8?19?? ▲????? ???? 11?2?42?? ???. ??? ??? 1?81? ?????? ???? ??? ?? ??? ???? ??? ??·???? ? ??? ??? ????? ?? ????? ??? ? ??.