| 年度 | 实际值 |
|---|---|
| 1978 | 395 |
| 1979 | |
| 1980 | 161 |
| 1981 | |
| 1982 | |
| 1983 | |
| 1984 | |
| 1985 | 201 |
| 1986 | |
| 1987 | |
| 1988 | |
| 1989 | |
| 1990 | 326 |
| 1991 | |
| 1992 | |
| 1993 | |
| 1994 | |
| 1995 | 8137 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 14864 |
| 2000 | 11582 |
| 2001 | 9734 |
| 2002 | 9074 |
| 2003 | 14844 |
| 2004 | 16535 |
| 2005 | 18480 |
| 2006 | 25187 |
| 2007 | 22683 |
| 2008 | 30485 |
| 2009 | 62066 |
| 2010 | 80277 |