| 年度 | 实际值 |
|---|---|
| 1992 | 20133 |
| 1993 | |
| 1994 | |
| 1995 | 21999 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 23708 |
| 2000 | 23427 |
| 2001 | 22887 |
| 2002 | 22076 |
| 2003 | 22117 |
| 2004 | 22860 |
| 2005 | 23581 |
| 2006 | 23892 |
| 2007 | 23414 |
| 2008 | 23882 |
| 2009 | 23788 |
| 2010 | 23095 |
| 2011 | 22642 |
| 2012 | 22801 |
| 2013 | 23029 |
| 2014 | 22108 |
| 2015 | 21887 |
| 2016 | 21909 |