15? ??????? ??? ?? ?? 5? ??? ???? ??(???)? ???? ?? 8265???(? 950??)? 3711???(? 427??)? ?? ?? ??? ?? 34%? 49.3% ????.

???? ?? ?? ???? ??? ??? ?? ??? ??? ??? ?? 1?5000???(? 1725??)? 9500???(? 1093??)? ??? ?? ?? 21%? 28.3% ???.

??? 5??? 500???(? 58??)??? ??? 10% ???. ?? ??? ‘??’ ?? ?? ???? 46.5%? ??? 2278???(? 262??)??? ??? ??? ????.

???? ?? ???? 5?8000???(? 6670??)? 10.5% ???. ??? ??? ??? ?? ??? ?? ?? 36.7%, 5.1% ???? ???.

? ?? ??? ??? ??? 1·4??(1～3?) 0.1% ???? 4? 0%, 5?? 2.2% ??? ?? ??? ??? ????? ????. ???? ??? ?? ???? ?? ??? ???? ??? ?.

???? ??? 1990? ?? ???? ???? ???? ????? ?? 1998? 34.6% ????. 2000? ?? ???? ????? ???? ?? ???? ??.

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