| 年度 | 实际值 |
|---|---|
| 1993 | 27000 |
| 1994 | 27300 |
| 1995 | 26800 |
| 1996 | 30000 |
| 1997 | 25000 |
| 1998 | 23400 |
| 1999 | |
| 2000 | 18815 |
| 2001 | 16531 |
| 2002 | 14453 |
| 2003 | 12137 |
| 2004 | 10653 |
| 2005 | 9190 |
| 2006 | 8671 |
| 2007 | 8096 |
| 2008 | 6938 |
| 2009 | 4693 |
| 2010 | 4569 |
| 2011 | 4410 |
| 2012 | 4404 |
| 2013 | 4366 |
| 2014 | 3828 |
| 2015 | 3776 |
| 2016 | 3662 |
| 2017 | 3588 |