| 年度 | 实际值 |
|---|---|
| 1992 | 31428 |
| 1993 | |
| 1994 | |
| 1995 | 30943 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 33114 |
| 2000 | 31640 |
| 2001 | 30270 |
| 2002 | 31191 |
| 2003 | 30192 |
| 2004 | 31363 |
| 2005 | 32298 |
| 2006 | 32949 |
| 2007 | 33353 |
| 2008 | 28555 |
| 2009 | 29507 |
| 2010 | 29274 |
| 2011 | 29513 |
| 2012 | 29745 |
| 2013 | 30591 |
| 2014 | 31270 |
| 2015 | 31548 |
| 2016 | 30668 |