| 年度 | 实际值 |
|---|---|
| 1994 | 2503 |
| 1995 | 2467 |
| 1996 | |
| 1997 | 17967 |
| 1998 | 18854 |
| 1999 | 19094 |
| 2000 | 19094 |
| 2001 | 18682 |
| 2002 | 19132 |
| 2003 | 16480 |
| 2004 | 14746 |
| 2005 | 13615 |
| 2006 | 13095 |
| 2007 | 12476 |
| 2008 | 12439 |
| 2009 | 12124 |
| 2010 | 12128 |
| 2011 | 12202 |
| 2012 | 12048 |
| 2013 | 11971 |
| 2014 | 12002 |
| 2015 | 12133 |
| 2016 | 12370 |