| 年度 | 实际值 |
|---|---|
| 1993 | 17599 |
| 1994 | 4467 |
| 1995 | 17763 |
| 1996 | 20846 |
| 1997 | 21168 |
| 1998 | 20959 |
| 1999 | 21317 |
| 2000 | 21008 |
| 2001 | 21386 |
| 2002 | 21386 |
| 2003 | 16922 |
| 2004 | 17521 |
| 2005 | 17411 |
| 2006 | 16292 |
| 2007 | 18000 |
| 2008 | 18200 |
| 2009 | |
| 2010 | 21523 |
| 2011 | 20684 |
| 2012 | 19000 |
| 2013 | 22372 |
| 2014 | 20400 |
| 2015 | 23664 |
| 2016 | 23819 |
| 2017 | 22000 |
| 2018 | 26563 |