| | | | | | | | | | 50 | | | | | | 2002 | 1992 31% 1.6 | 300 | 12 | 2.4 | | 6 | | ① | ② | ③ 20 | 3 10 1.5 | ④ | ⑤ | | ⑥ | . | 99% | 90% | | | | | | | | | | | 42 2007 25-30 | | | | | ① | ② | | ③ ④ | | | ⑤ | |