???? "30~39?? ???? ??? 2003? ??? 10.9%?? 2008? 12%? ??? 40~49?? ??? ?? ?? 10.1%?? 12.5%? ????"? "????? 20? ??? ???? 30,40? ???? ???? ???? ?? ?"??? ????.
???? ??? ???? ??? ?? △?? ??? ?? ?? ??? ???? △?? ??????? ?? ??? ??? ??? ???? ???? ?? ??? △???? ??? ???? ???? ????? ????.
????? bookum90@donga.com