| 年度 | 实际值 |
|---|---|
| 1992 | 20040 |
| 1993 | |
| 1994 | |
| 1995 | 21630 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 21159 |
| 2000 | 21340 |
| 2001 | 20870 |
| 2002 | 18705 |
| 2003 | 17938 |
| 2004 | 17435 |
| 2005 | 16762 |
| 2006 | 16175 |
| 2007 | 16277 |
| 2008 | 14675 |
| 2009 | 15645 |
| 2010 | 15434 |
| 2011 | 15700 |
| 2012 | 16129 |
| 2013 | 15783 |
| 2014 | 15777 |
| 2015 | 15812 |
| 2016 | 15516 |