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| Äê¶È | µÚÒ»²úÒµ | µÚ¶þ²úÒµ | µÚÈý²úÒµ |
| 1965 | 27.4 | 28.6 | 44 |
| 1970 | 17.9 | 34.7 | 47.4 |
| 1975 | 14.9 | 39.1 | 46 |
| 1980 | 9.2 | 45 | 45.8 |
| 1985 | 6.9 | 44.9 | 48.2 |
| 1990 | 5.5 | 43.1 | 51.4 |
| 1995 | 4 | 36 | 60 |
| 1998 | 2.9 | 34 | 63.1 |
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