| 年度 | 实际值 |
|---|---|
| 1992 | 26495 |
| 1993 | |
| 1994 | |
| 1995 | 30143 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 32096 |
| 2000 | 32060 |
| 2001 | 30797 |
| 2002 | 27615 |
| 2003 | 26409 |
| 2004 | 25907 |
| 2005 | 25437 |
| 2006 | 24868 |
| 2007 | 25212 |
| 2008 | 20664 |
| 2009 | 22412 |
| 2010 | 21903 |
| 2011 | 22474 |
| 2012 | 23140 |
| 2013 | 23659 |
| 2014 | 22812 |
| 2015 | 24207 |
| 2016 | 23386 |