| 年度 | 实际值 |
|---|---|
| 1992 | 45080 |
| 1993 | |
| 1994 | |
| 1995 | 40950 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 42688 |
| 2000 | 37160 |
| 2001 | 32510 |
| 2002 | 31270 |
| 2003 | 28420 |
| 2004 | 33150 |
| 2005 | 33560 |
| 2006 | 33800 |
| 2007 | 33980 |
| 2008 | 28780 |
| 2009 | 30280 |
| 2010 | 29470 |
| 2011 | 29470 |
| 2012 | 29770 |
| 2013 | 29800 |
| 2014 | 25850 |
| 2015 | 25780 |
| 2016 | 25330 |