' . , ' . KOREA .
. 1 4 , --SBA 3 . . (46.1%, ) . (10 30.5%, 20 46.5%, 30 48.5%, 40 50.5%, 50 54.5%) . 1981 .
" "
819356 , (71581), (69279), (69199), (67963) . [] 14 . . , . , , . (). ...
, . . , . 1 (1987~1999) (2000~2009) 2 (2010~) . SNS . SNS , , .
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. . . , , , , . . 2000 , , .
, 14
K- K- . 1990 . K- 2000 .
, . . 2018 . , . . , , .
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. . 500 , 100 . , . , ,