| 年度 | 实际值 |
|---|---|
| 1993 | 222 |
| 1994 | 222 |
| 1995 | 222 |
| 1996 | 222 |
| 1997 | |
| 1998 | 18915 |
| 1999 | 1783 |
| 2000 | 19541 |
| 2001 | 19541 |
| 2002 | 19541 |
| 2003 | 19541 |
| 2004 | 19541 |
| 2005 | 19541 |
| 2006 | 19541 |
| 2007 | 19541 |
| 2008 | 19541 |
| 2009 | |
| 2010 | 18847 |
| 2011 | 18847 |
| 2012 | 18847 |
| 2013 | 15841 |
| 2014 | 18757 |
| 2015 | 18787 |
| 2016 | 18787 |
| 2017 | 18787 |
| 2018 | 18787 |