| 年度 | 实际值 |
|---|---|
| 1993 | 37000 |
| 1994 | 37000 |
| 1995 | 38000 |
| 1996 | 40000 |
| 1997 | 36400 |
| 1998 | 32700 |
| 1999 | 32266 |
| 2000 | 30260 |
| 2001 | 28751 |
| 2002 | 25843 |
| 2003 | 24492 |
| 2004 | 22065 |
| 2005 | 19294 |
| 2006 | 17045 |
| 2007 | 15112 |
| 2008 | 15564 |
| 2009 | 13031 |
| 2010 | 11419 |
| 2011 | 10399 |
| 2012 | 9489 |
| 2013 | 8823 |
| 2014 | 8371 |
| 2015 | 8283 |
| 2016 | 7832 |
| 2017 | 7464 |