| 年度 | 实际值 |
|---|---|
| 1992 | 33171 |
| 1993 | |
| 1994 | |
| 1995 | 36200 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 36925 |
| 2000 | 36840 |
| 2001 | 36401 |
| 2002 | 33680 |
| 2003 | 31307 |
| 2004 | 30330 |
| 2005 | 30388 |
| 2006 | 30176 |
| 2007 | 28395 |
| 2008 | 26134 |
| 2009 | 27368 |
| 2010 | 26575 |
| 2011 | 26707 |
| 2012 | 26351 |
| 2013 | 26614 |
| 2014 | 26587 |
| 2015 | 26754 |
| 2016 | 26361 |