| 年度 | 实际值 |
|---|---|
| 1992 | 24354 |
| 1993 | |
| 1994 | |
| 1995 | 27296 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 29121 |
| 2000 | 28490 |
| 2001 | 27889 |
| 2002 | 27228 |
| 2003 | 26675 |
| 2004 | 26548 |
| 2005 | 27130 |
| 2006 | 27254 |
| 2007 | 26718 |
| 2008 | 16276 |
| 2009 | 17357 |
| 2010 | 17606 |
| 2011 | 17939 |
| 2012 | 18487 |
| 2013 | 18965 |
| 2014 | 18908 |
| 2015 | 18656 |
| 2016 | 18816 |