| 年度 | 实际值 |
|---|---|
| 1993 | 15368 |
| 1994 | 15368 |
| 1995 | 15294 |
| 1996 | 15294 |
| 1997 | 15398 |
| 1998 | 15398 |
| 1999 | 15398 |
| 2000 | 15398 |
| 2001 | 15398 |
| 2002 | 15400 |
| 2003 | 15400 |
| 2004 | 15400 |
| 2005 | 15398 |
| 2006 | 15398 |
| 2007 | 15318 |
| 2008 | 15318 |
| 2009 | |
| 2010 | 15318 |
| 2011 | 15318 |
| 2012 | 15318 |
| 2013 | 15318 |
| 2014 | 15402 |
| 2015 | 15402 |
| 2016 | 13538 |
| 2017 | 13543 |
| 2018 | 13538 |