| 年度 | 实际值 |
|---|---|
| 1992 | 48137 |
| 1993 | |
| 1994 | |
| 1995 | 51554 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 52603 |
| 2000 | 51920 |
| 2001 | 52069 |
| 2002 | 50560 |
| 2003 | 39204 |
| 2004 | 39006 |
| 2005 | 38650 |
| 2006 | 38123 |
| 2007 | 37976 |
| 2008 | 37052 |
| 2009 | 38983 |
| 2010 | 38698 |
| 2011 | 39579 |
| 2012 | 39704 |
| 2013 | 39914 |
| 2014 | 24960 |
| 2015 | 24708.7 |
| 2016 | 24721 |