| 年度 | 实际值 |
|---|---|
| 1992 | 13721 |
| 1993 | |
| 1994 | |
| 1995 | 16803 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 16503 |
| 2000 | 19940 |
| 2001 | 18734 |
| 2002 | 18868 |
| 2003 | 18551 |
| 2004 | 18779 |
| 2005 | 18196 |
| 2006 | 16377 |
| 2007 | 15393 |
| 2008 | 19838 |
| 2009 | 19208 |
| 2010 | 17785 |
| 2011 | 18409 |
| 2012 | 17860 |
| 2013 | 17670 |
| 2014 | 17501 |
| 2015 | 17142 |
| 2016 | 13822 |