| 年份 | 单位：% |
| 2011 | 177.11 |
| 2010 | 209.21 |
| 2009 | 128.54 |
| 2008 | 280.53 |
| 2007 | 168.57 |
| 2006 | 180.82 |
| 2005 | 228.72 |
| 2004 | 236.09 |
| 2003 | 120.74 |
| 2002 | 106.74 |
| 2001 | 107.42 |
| 2000 | 167.42 |
| 1999 | 133.87 |
| 1998 | 213.52 |
| 1997 | 201.20 |
| 1996 | 120.53 |
| 1995 | 175.15 |
| 1994 | 164.65 |
| 1993 | 151.54 |
| 1992 | 100.32 |
| 1991 | 53.65 |
| 1990 | 29.04 |
| 1989 | 19.55 |
| 1988 | 16.04 |
| 1987 | 5.02 |
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