| 年度 | 实际值 |
|---|---|
| 1992 | 28391 |
| 1993 | |
| 1994 | 26000 |
| 1995 | 31475 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 33490 |
| 2000 | 33755 |
| 2001 | 32144 |
| 2002 | 31372 |
| 2003 | 30612 |
| 2004 | 30372 |
| 2005 | 30720 |
| 2006 | 32994 |
| 2007 | 31860 |
| 2008 | 26783 |
| 2009 | 27671 |
| 2010 | 26314 |
| 2011 | 26717 |
| 2012 | 27298 |
| 2013 | 28197 |
| 2014 | 28997 |
| 2015 | 28922 |
| 2016 | 28824 |