| 年度 | 实际值 |
|---|---|
| 1986 | 932 |
| 1987 | 902 |
| 1988 | 1106 |
| 1989 | 1251 |
| 1990 | 1385 |
| 1991 | 2016 |
| 1992 | 1262 |
| 1993 | 1552 |
| 1994 | 1863 |
| 1995 | 1990 |
| 1996 | 1878 |
| 1997 | 2225 |
| 1998 | 2059 |
| 1999 | 2312 |
| 2000 | 2042 |
| 2001 | 7859 |
| 2002 | 6147 |
| 2003 | 6056 |
| 2004 | 5932 |
| 2005 | 5916 |
| 2006 | 5023 |
| 2007 | 5204 |
| 2008 | 5837 |
| 2009 | 6776 |
| 2010 | 6110 |
| 2011 | 5569 |
| 2012 | 4978 |
| 2013 | 5219 |
| 2014 | 4738 |
| 2015 | 4125 |