| 年度 | 实际值 |
|---|---|
| 1992 | 22025 |
| 1993 | |
| 1994 | |
| 1995 | 24881 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 32118 |
| 2000 | 29070 |
| 2001 | 29053 |
| 2002 | 28622 |
| 2003 | 28640 |
| 2004 | 29017 |
| 2005 | 29615 |
| 2006 | 29370 |
| 2007 | 28855 |
| 2008 | 19764 |
| 2009 | 20351 |
| 2010 | 21030 |
| 2011 | 21313 |
| 2012 | 21329 |
| 2013 | 21374 |
| 2014 | 22029 |
| 2015 | 23629 |
| 2016 | 21160 |