| 年度 | 实际值 |
|---|---|
| 1992 | 25643 |
| 1993 | |
| 1994 | |
| 1995 | 26534 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 30559 |
| 2000 | 30770 |
| 2001 | 30889 |
| 2002 | 31248 |
| 2003 | 27810 |
| 2004 | 24578 |
| 2005 | 25222 |
| 2006 | 25064 |
| 2007 | 24318 |
| 2008 | 21421 |
| 2009 | 23449 |
| 2010 | 23592 |
| 2011 | 23867 |
| 2012 | 24370 |
| 2013 | 25544 |
| 2014 | 26036 |
| 2015 | 26529 |
| 2016 | 27178 |