| 年度 | 实际值 |
|---|---|
| 1993 | 33000 |
| 1994 | |
| 1995 | |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 33762 |
| 2000 | 31879 |
| 2001 | 29668 |
| 2002 | 31879 |
| 2003 | 24943 |
| 2004 | 22966 |
| 2005 | 22149 |
| 2006 | 22560 |
| 2007 | 21449 |
| 2008 | 20868 |
| 2009 | 20251 |
| 2010 | 20723 |
| 2011 | 21638 |
| 2012 | 21861 |
| 2013 | 22713 |
| 2014 | 23469 |
| 2015 | 24279 |
| 2016 | 24616 |
| 2017 | 24799 |