| 年度 | 实际值 |
|---|---|
| 1993 | 24000 |
| 1994 | 23400 |
| 1995 | 23100 |
| 1996 | 20000 |
| 1997 | 23100 |
| 1998 | |
| 1999 | |
| 2000 | 25394 |
| 2001 | 24345 |
| 2002 | 26077 |
| 2003 | 25398 |
| 2004 | 24765 |
| 2005 | 25102 |
| 2006 | 25250 |
| 2007 | 25254 |
| 2008 | 24359 |
| 2009 | 23294 |
| 2010 | 44151 |
| 2011 | 21540 |
| 2012 | 21507 |
| 2013 | 21607 |
| 2014 | 21146 |
| 2015 | 20787 |
| 2016 | 20301 |
| 2017 | 19304 |