?????? ????? 4?? ??? ??? 20～50? ??? 1136??? ‘?? ??? ??? ???’? ????? ?? ???? ??, ???? ?? ? ?? ?? ???? ??? ???? ‘????’? ??? ??? ???? 3? ???.

50? ??? 20?? ???? ???? ??? 50?? 2.4%, 20?? 9.8%??? ???? ??? 50? 11.8%, 20? 48.3%??.

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

?? ‘?? 1～3??’ ? ?? ??? ??? ??? △50?(6.3%) △40?(7.2%) △30?(7.5%), △20?(15.9%) ??? ????.

??? ?? hanwshin@donga.com