40, 50???? ??? ??
60? ???? ??? ??
?? ???? ‘??(????)’ ????? ??? ??? ??? ??. ???? ??? ??? ???? 28.4%??, ???? ??? ??? 29.4%? ???? ????.
? ??? ?? ??? ????? ?? ??? ??? ??.
?? ????? ?? 40, 50???? ? ??? ?? 11.5%???, 12.7%???? ???. 60? ????? ? ??? 11.7%??? ?? ??? ????.
??? 25? 3? ?????? ? ??? 28.3%, ? ??? 28.4%? ???? ????.
??? ?? jin0619@donga.com
??? ?? mhpark@donga.com