| 年度 | 实际值 |
|---|---|
| 1992 | 21753 |
| 1993 | |
| 1994 | |
| 1995 | 13126 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 32181 |
| 2000 | 25130 |
| 2001 | 24715 |
| 2002 | 16015 |
| 2003 | 11703 |
| 2004 | 14402 |
| 2005 | 14251 |
| 2006 | 17366 |
| 2007 | 17547 |
| 2008 | 20247 |
| 2009 | 15344 |
| 2010 | 17020 |
| 2011 | 20501 |
| 2012 | 20131 |
| 2013 | 22500 |
| 2014 | 19681 |
| 2015 | 24060 |
| 2016 | 24710 |