| 年度 | 实际值 |
|---|---|
| 1978 | 2038 |
| 1979 | |
| 1980 | 626 |
| 1981 | |
| 1982 | |
| 1983 | |
| 1984 | |
| 1985 | 786 |
| 1986 | |
| 1987 | |
| 1988 | |
| 1989 | |
| 1990 | 453 |
| 1991 | |
| 1992 | |
| 1993 | |
| 1994 | |
| 1995 | 4741 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 5970 |
| 2000 | 5052 |
| 2001 | 2924 |
| 2002 | 3891 |
| 2003 | 1928 |
| 2004 | 3718 |
| 2005 | 5335 |
| 2006 | 6293 |
| 2007 | 17121 |
| 2008 | 2878 |
| 2009 | 45747 |
| 2010 | 75333 |