6? ????? ?? ??? ???? ??? 1990? ?? ?? ??? ??? ????. ??? ??? ????? ????? ??? ?? ???? ? ??? ???? ?? ??? ???? ?? ??? ??? ??? ??? ???? ????? ??? ??? ??.

????? 19? ??? ‘????? ??’ ??? ??? ??? ?????? ??? ????? ??? 125??? 5??? 26? ????.

? ?? ????? △1? 262? △2? 230? △3? 223? △4? 219? △5? 151? ??? ???? ???? 6??? 19? ?? ?? ??? ????. ??? “?? ?? ??, ???? ??, ??? ??? ?? ???? ??? ????? ?? ??? ????? ??? ??? ??? ??? ???”? ????.

????? ??? ?? ????? ??? 5392??? 5?(4029?)? ?? 1363??? ?? 2005? 3?(5043?) ?? ???? ????. ?? ???? ??? ??? ??? ???? ?? ??? ?? ?? ??? ???? ???? ???.

?? ?? ?????? ??? 0.02%? 5?(0.04%)?? 0.02%??? ????. ????? ??? ?????? ??? 0.01%? 5?? ?? 0.02%??? ??? ?? ??? ?????? 5? 0.09%?? 6? 0.15%? 0.06%??? ????.

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