| 年度 | 实际值 |
|---|---|
| 1992 | 12526 |
| 1993 | |
| 1994 | |
| 1995 | 12217 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 12528 |
| 2000 | 12332 |
| 2001 | 13951 |
| 2002 | 17317 |
| 2003 | 17573 |
| 2004 | 17124 |
| 2005 | 19038 |
| 2006 | 18624 |
| 2007 | 18357 |
| 2008 | 16805 |
| 2009 | 17682 |
| 2010 | 19679 |
| 2011 | 18211 |
| 2012 | 18290 |
| 2013 | 17295 |
| 2014 | 17179 |
| 2015 | 17026 |
| 2016 | 17874 |