| 年度 | 实际值 |
|---|---|
| 1992 | 29139 |
| 1993 | |
| 1994 | |
| 1995 | 27723 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 26278 |
| 2000 | 25180 |
| 2001 | 24235 |
| 2002 | 21658 |
| 2003 | 20568 |
| 2004 | 20382 |
| 2005 | 20652 |
| 2006 | 18866 |
| 2007 | 17278 |
| 2008 | 9572 |
| 2009 | 10231 |
| 2010 | 10702 |
| 2011 | 11218 |
| 2012 | 11941 |
| 2013 | 12591 |
| 2014 | 12697 |
| 2015 | 12409 |
| 2016 | 12410 |