| 年度 | 实际值 |
|---|---|
| 1992 | 19294 |
| 1993 | |
| 1994 | |
| 1995 | 20357 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 22695 |
| 2000 | 22950 |
| 2001 | 22376 |
| 2002 | 20848 |
| 2003 | 19763 |
| 2004 | 19891 |
| 2005 | 17706 |
| 2006 | 16408 |
| 2007 | 10255 |
| 2008 | 9373 |
| 2009 | 10609 |
| 2010 | 11067 |
| 2011 | 11706 |
| 2012 | 11823 |
| 2013 | 12071 |
| 2014 | 12059 |
| 2015 | 12078 |
| 2016 | 11999 |