| 年度 | 实际值 |
|---|---|
| 1980 | 15 |
| 1981 | |
| 1982 | |
| 1983 | |
| 1984 | |
| 1985 | 15 |
| 1986 | |
| 1987 | |
| 1988 | |
| 1989 | |
| 1990 | 72 |
| 1991 | |
| 1992 | |
| 1993 | |
| 1994 | |
| 1995 | 415 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 2404 |
| 2001 | 2674 |
| 2002 | 1320 |
| 2003 | 1702 |
| 2004 | 2156 |
| 2005 | 8732 |
| 2006 | 50239 |
| 2007 | 10184 |
| 2008 | 8070 |
| 2009 | 139 |
| 2010 | 5669 |
| 2011 | 3000 |
| 2012 | 3000 |
| 2013 | .3 |
| 2014 | 6200 |
| 2015 | 6908 |