| 年度 | 实际值 |
|---|---|
| 1978 | 66 |
| 1979 | |
| 1980 | 154 |
| 1981 | |
| 1982 | |
| 1983 | |
| 1984 | |
| 1985 | 138 |
| 1986 | |
| 1987 | |
| 1988 | |
| 1989 | |
| 1990 | 628 |
| 1991 | |
| 1992 | |
| 1993 | |
| 1994 | |
| 1995 | 409 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 10099 |
| 2000 | 4038 |
| 2001 | 2343 |
| 2002 | 2248 |
| 2003 | 3005 |
| 2004 | 2621 |
| 2005 | 4740 |
| 2006 | 8813 |
| 2007 | 3256 |
| 2008 | 10564 |
| 2009 | 13824 |
| 2010 | 29942 |