???? ????? ??????? ?????? ?? 20～40? ?? 1000??? ‘2006? ??? ?? ??? ?? ??’? ????? ?? ??? ?? 38.0%? ??·????? ???.

??? ????? 30? ??? 65.9% ? ?? ?? 61.4%? ?? ??? ?? ???? ????. ??(14.6%)? ???? ????? 20?(10.8%) 30?(16.2%) 40?(16.9%)? ??? ???? ?? ???.

??? ???? ???? ?? ??? ?? ??? ??? ?? ?? ?? ??(29.1%). 40.4%? ??(17.8%)?? ?? ???. ? ??? 30? ??(27.5%)? ?? ???? ?? ??? ‘??(17.9%)’???. ?? ‘???(9.55%)’ ‘???(5.5%)’ ????.

???? 20?(5.1%) 30?(8.1%) 40?(15.4%)? ??? ????, ???? 20?(9.6%) 30?(5.7%) 40?(1.2%)? ??? ???? ?? ???.

??? ?? ray@donga.com

(▲?? ??? ??? ???? ?? ???? ???? ?????. ????? ???? ? ????? ??? ? ????.)