| 年度 | 实际值 |
|---|---|
| 1992 | 26015 |
| 1993 | |
| 1994 | |
| 1995 | 26753 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 25789 |
| 2000 | 23300 |
| 2001 | 24740 |
| 2002 | 24483 |
| 2003 | 23571 |
| 2004 | 22590 |
| 2005 | 22808 |
| 2006 | 23814 |
| 2007 | 23450 |
| 2008 | 22266 |
| 2009 | 22627 |
| 2010 | 22198 |
| 2011 | 22111 |
| 2012 | 23115 |
| 2013 | 22879 |
| 2014 | 22865 |
| 2015 | 22700 |
| 2016 | 22713 |