| 年度 | 实际值 |
|---|---|
| 1992 | 19842 |
| 1993 | |
| 1994 | 15000 |
| 1995 | 13505 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 19505 |
| 2000 | 20020 |
| 2001 | 12775 |
| 2002 | 13794 |
| 2003 | 8875 |
| 2004 | 14536 |
| 2005 | 17264 |
| 2006 | 15960 |
| 2007 | 16993 |
| 2008 | 18236 |
| 2009 | 20637 |
| 2010 | 27101 |
| 2011 | 25998 |
| 2012 | 21157 |
| 2013 | 20765 |
| 2014 | 21852 |
| 2015 | 21760 |
| 2016 | 25354 |