| 年度 | 实际值 |
|---|---|
| 1992 | 20003 |
| 1993 | |
| 1994 | |
| 1995 | 21177 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 24556 |
| 2000 | 23500 |
| 2001 | 22710 |
| 2002 | 21529 |
| 2003 | 18620 |
| 2004 | 16550 |
| 2005 | 16013 |
| 2006 | 15313 |
| 2007 | 14847 |
| 2008 | 11826 |
| 2009 | 12074 |
| 2010 | 12773 |
| 2011 | 13015 |
| 2012 | 13501 |
| 2013 | 13722 |
| 2014 | 13319 |
| 2015 | 13338 |
| 2016 | 13100 |