| 年度 | 实际值 |
|---|---|
| 1993 | 25000 |
| 1994 | 25900 |
| 1995 | 26600 |
| 1996 | 30000 |
| 1997 | 28100 |
| 1998 | 28600 |
| 1999 | |
| 2000 | 27636 |
| 2001 | 26696 |
| 2002 | 25919 |
| 2003 | 25738 |
| 2004 | 25742 |
| 2005 | 25578 |
| 2006 | 25749 |
| 2007 | 26426 |
| 2008 | 26905 |
| 2009 | 26588 |
| 2010 | 26304 |
| 2011 | 26418 |
| 2012 | 26194 |
| 2013 | 25053 |
| 2014 | 25187 |
| 2015 | 24965 |
| 2016 | 25141 |
| 2017 | 24972 |