19? ?????????? ??? 12? ?? ???? 502?? 1～9? ?? ??? ?????? ?? 3?3053???? ?? ?? ??? ?? 25.2% ????.

???? ??? ??? ????? ???? ??? ??? ‘0’? ? ??? ??? ??? ?????? ? ???? 7200??? ?? ??? ?????? ??? 56.6% ??? ???.

??? ?????? ?? ????? ???? ??? 16.5%? ?? ?? ???? 3.1%??? ????.

??? ?????? ??? ??? ???? ??? ??? 72??? ??? 14.3%??. ?? ??? 430??(85.7%)? ??? ???? ??? ???? ?????.

? 3·4??(7～9?) ??? ?????? ??? 1?8578???? ?? ??? ????(2345??) ??SDI(1998??) ?????(1997??) ?? ?? ???.

?? 3·4?? ??? ?????? ?? ?? ??? ??? ?????, ??? 8327?? ???? ?? 1271?? ??? ????. SK?? ??? 4875?? ???? 739?? ??? ????.

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