???????? ‘99 ?? ???’? ??? ?????? ???? ?? 1?9?93?? ???? ??? ?????? ??? ??? ???? 12? ???.

??? ??? ?? ??????? ?? 30?～40????? ???? 30.5%? ?? ??? ?? △40?～60??(26.9%) △30??(23.2%) △60?～80??(12.9%) ?.

??? ?? ??? ??? ??? ??? ??, ???? ?? ??? ‘????’? ????. ‘????’? ???? 31.7%? ??.

?? ???? ?? ???? ?? ??? ??? 5～6???? ??? ???? 19.9%? ?? ???. ?? △4～5?(15.3%) △3～4?(14.5%) △6～8?(11.9%) △8～10?(11.2%) △10～12?(10.1%) △3???(10.1%) ?.

????? ?? ??? ???(40.9%)? ?? ???? ??? ???? ???.

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