| 年度 | 实际值 |
|---|---|
| 1992 | 12802 |
| 1993 | |
| 1994 | |
| 1995 | 9029 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 13326 |
| 2000 | 13084 |
| 2001 | 15599 |
| 2002 | 15470 |
| 2003 | 17022 |
| 2004 | 18540 |
| 2005 | 19483 |
| 2006 | 19494 |
| 2007 | 20021 |
| 2008 | 18968 |
| 2009 | 20844 |
| 2010 | 19477 |
| 2011 | 16801 |
| 2012 | 16851 |
| 2013 | 17074 |
| 2014 | 16822 |
| 2015 | 14055 |
| 2016 | 13373 |