???? ????? ??????? ?????? ?? 20～40? ?? 1000??? ‘?? ????? ?? ??? ??? ?? ?? ??’? ????? ????? ?? 27.3%? ‘??(??)’? ???.

??? ????? ??? ??? ?? ???? 30?(32.6%)? 40?(29.2%)? 20?(20.1%)?? ???. ?? 30? ??(35.9%)? ???? ?????? ??(24.6%)?? ??(30%)? ???.

?? ????? ‘?? ??’(24.3%)? ?? ??? ???. 20?? 30.2%?, ‘????’(24.0%)? ??(20.1%)?? ??. 30?(19.8%)?? 40?(22.9%)? ??? ?? ??? ?? ??.

? ??? ????(21.5%)? ??(31.6%)? ?? ?? ????? ??(11.4%)? ? ??? ???.

????? ‘??’(17.9%) ‘??’(7.1%) ‘??’(1.9%) ????. ??? 20?(18.0%) 30?(17.4%) 40?(18.4%)? ??????, ??? 20?(6.6%) 30?(6.6%)?? 40?(8.1%)? ?? ????.

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