| 年度 | 实际值 |
|---|---|
| 1993 | 8000 |
| 1994 | 8300 |
| 1995 | 8300 |
| 1996 | 10000 |
| 1997 | |
| 1998 | |
| 1999 | |
| 2000 | 38499 |
| 2001 | 39998 |
| 2002 | 36816 |
| 2003 | 34854 |
| 2004 | 32765 |
| 2005 | 30886 |
| 2006 | 30472 |
| 2007 | 28883 |
| 2008 | 27509 |
| 2009 | 27220 |
| 2010 | 26121 |
| 2011 | 26167 |
| 2012 | 23614 |
| 2013 | 22831 |
| 2014 | 22806 |
| 2015 | 23673 |
| 2016 | 24338 |
| 2017 | 24979 |