| 年度 | 实际值 |
|---|---|
| 1992 | 17288 |
| 1993 | |
| 1994 | |
| 1995 | 17084 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 16545 |
| 2000 | 16290 |
| 2001 | 13208 |
| 2002 | 11349 |
| 2003 | 10407 |
| 2004 | 11343 |
| 2005 | 12146 |
| 2006 | 12015 |
| 2007 | 11637 |
| 2008 | 11163 |
| 2009 | 12199 |
| 2010 | 12765 |
| 2011 | 12893 |
| 2012 | 12864 |
| 2013 | 13152 |
| 2014 | 13060 |
| 2015 | 12933 |
| 2016 | 13013 |