| 年度 | 实际值 |
|---|---|
| 1978 | 174 |
| 1979 | |
| 1980 | 344 |
| 1981 | |
| 1982 | |
| 1983 | |
| 1984 | |
| 1985 | 191 |
| 1986 | |
| 1987 | |
| 1988 | |
| 1989 | |
| 1990 | 724 |
| 1991 | |
| 1992 | |
| 1993 | |
| 1994 | |
| 1995 | 3986 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 4487 |
| 2000 | 8336 |
| 2001 | 7311 |
| 2002 | 9674 |
| 2003 | 14542 |
| 2004 | 28161 |
| 2005 | 13511 |
| 2006 | 18951 |
| 2007 | 23235 |
| 2008 | 44799 |
| 2009 | 81077 |
| 2010 | 22777 |