| 年度 | 实际值 |
|---|---|
| 1992 | 12150 |
| 1993 | |
| 1994 | |
| 1995 | 9806 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 10079 |
| 2000 | 10175 |
| 2001 | 10672 |
| 2002 | 19046 |
| 2003 | 18669 |
| 2004 | 18994 |
| 2005 | 19252 |
| 2006 | 19591 |
| 2007 | 18844 |
| 2008 | 18204 |
| 2009 | 19813 |
| 2010 | 20041 |
| 2011 | 20903 |
| 2012 | 20648 |
| 2013 | 20796 |
| 2014 | 20276 |
| 2015 | 20123 |
| 2016 | 19529 |