| 年度 | 实际值 |
|---|---|
| 1992 | 32283 |
| 1993 | |
| 1994 | |
| 1995 | 30469 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 33707 |
| 2000 | 34460 |
| 2001 | 33704 |
| 2002 | 32900 |
| 2003 | 30908 |
| 2004 | 30707 |
| 2005 | 30385 |
| 2006 | 29534 |
| 2007 | 27066 |
| 2008 | 24860 |
| 2009 | 25179 |
| 2010 | 24857 |
| 2011 | 25334 |
| 2012 | 25745 |
| 2013 | 25887 |
| 2014 | 24310 |
| 2015 | 23460 |
| 2016 | 23517 |