| 年份 | 单位：% |
| 2010 | 93.11 |
| 2009 | 94.50 |
| 2008 | 92.60 |
| 2007 | 92.20 |
| 2006 | 92.70 |
| 2005 | 92.70 |
| 2004 | 92.50 |
| 2003 | 91.70 |
| 2002 | 90.20 |
| 2001 | 91.90 |
| 2000 | 93.50 |
| 1999 | 93.20 |
| 1998 | 94.70 |
| 1997 | 94.90 |
| 1996 | 75.70 |
| 1995 | 86.80 |
| 1994 | 84.80 |
| 1993 | 82.80 |
| 1992 | 55.70 |
| 1991 | 57.40 |
| 1990 | 60.40 |
| 1989 | 59.70 |
| 1988 | 61.60 |
| 1987 | 59.20 |
| 1986 | 58.80 |
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