??? ????? 1977? ??? ??? ??? ???? ??? ????? ???? ?????. ?? ??? ??? ??? ???? ???, ???? ???? ???? ?? ???? ???? ??? ?? ?? ????? ?. ??? ??? ????? ???? ?? ????? ?? ???? ???? ????? ??? ??? ???? ? ??? ??? ??? ??? ???? ??? ???. ??? ? ????? ??? ??? ????? ??? ?????? ???? ???? ??? ??? ??? 20????? ????.

??? ??? ??? ??? ??? ??? ?? ??? ??? ‘????’?? ???? ???? ??? ???? ??.

???? ???? ??? ??? ?? ?? ??? ??? ????? ??? ? ??? ?? ??? ????? 6??? ?? ????? ??? ?? ???? ?? ??.

???? 2～4%? ??? ??? ??? ???? ??? ??? ?? ???? ? ????? ???? ???? ?? ??.

??? ??? ???. ????? ?? ‘???’?? ‘?????’? ??????? ???? ?? ??. 97?? ????????? ???????? ??? ???? ?? ??? ???? ???? ????? ???? ???? ?? ????.

96?? ????? ?????? ???? ???? 10% ??? ???? ??? ???? ?? ???????? “????? ????? ??? ??? ??? ??”? ????.

‘???? ????’? ??? ‘??? ??’??? ?????? ?????? ??? ????? ???? ???? ??.

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