| 年度 | 实际值 |
|---|---|
| 1993 | 18823 |
| 1994 | 18823 |
| 1995 | 18823 |
| 1996 | 18823 |
| 1997 | 18823 |
| 1998 | 18823 |
| 1999 | 18823 |
| 2000 | 18823 |
| 2001 | 18823 |
| 2002 | 18823 |
| 2003 | 18823 |
| 2004 | 18823 |
| 2005 | 18823 |
| 2006 | 18823 |
| 2007 | 18823 |
| 2008 | 18823 |
| 2009 | |
| 2010 | 18823 |
| 2011 | 18823 |
| 2012 | 18823 |
| 2013 | 19078 |
| 2014 | 19078 |
| 2015 | 19798 |
| 2016 | 19798 |
| 2017 | 19085 |
| 2018 | 19853 |