| 年度 | 实际值 |
|---|---|
| 1978 | 156 |
| 1979 | |
| 1980 | 410 |
| 1981 | |
| 1982 | |
| 1983 | |
| 1984 | |
| 1985 | 659 |
| 1986 | |
| 1987 | |
| 1988 | |
| 1989 | |
| 1990 | 160 |
| 1991 | |
| 1992 | |
| 1993 | |
| 1994 | |
| 1995 | 5406 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 2913 |
| 2000 | 2300 |
| 2001 | 4784 |
| 2002 | 5554 |
| 2003 | 9638 |
| 2004 | 8443 |
| 2005 | 7174 |
| 2006 | 12610 |
| 2007 | 7740 |
| 2008 | 18055 |
| 2009 | 34823 |
| 2010 | 67669 |