?? 6.2 ?????? 20¤30? ???? ???? 40％?? ??? ??? ????.
?? ??????? ?? ???? ??? ??? 26? ???????????? ???? ??? ??? ?? 6? 2? ??? ?????? ???? ???? △19? 47.4％, △20? ?? 45.8％ △20? ?? 37.1％ △30? ?? 41.9％ △30? ?? 50.0％ △40?? 55％ △ 50?? 64.1％ △60? ??? 69.3％??.
?? 2006? ???? ??? 4¤10％ ??? ?? ??? ????. ???? △19? 37.9％ △20? ?? 38.3％ △20? ?? 29.6％ △30? ?? 37.0％ △30? ?? 45.6％? ????. ? 40?? 55.4％, 50?? 68.2％, 60? ??? 70.9％? ????.
2006? ?????? ???? ???? ??? 19?? ?? 37.9％?? 47.4％? ?? ?? ? ??? ????? 40¤50?? ???? ??? ??? ???.
?? 2008? ??? ???? ??? 10¤15％ ??? ??? ???, ?? ???? △19? 33.2％ △20? ?? 32.9％ △20? ?? 24.2％ △30? ?? 31.0％ △30? ?? 39.4％? ??? ???.
??????? △??? 66.5％ △??? 60.6％ △???? 54.2％ △??? 53.8％ △??? 50.2％ ????.
????? ???? 11.8％?? ???? ???? ??? ???? ??? ???? ???? 35.2％? ????.
? ??? "??? ? ?? ???????? ???? ?? ??? ???? ??? ?"??? "????? ???? ?? ??? ?? ???? ??? ????? ??? ??? ??"? ???.
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