| 年度 | 实际值 |
|---|---|
| 1992 | 20858 |
| 1993 | |
| 1994 | |
| 1995 | 23252 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 27211 |
| 2000 | 28060 |
| 2001 | 29004 |
| 2002 | 28704 |
| 2003 | 27498 |
| 2004 | 29980 |
| 2005 | 30853 |
| 2006 | 33346 |
| 2007 | 30300 |
| 2008 | 23703 |
| 2009 | 24170 |
| 2010 | 24079 |
| 2011 | 24757 |
| 2012 | 25081 |
| 2013 | 25620 |
| 2014 | 26807 |
| 2015 | 26796 |
| 2016 | 26706 |