| 年度 | 实际值 |
|---|---|
| 1992 | 23957 |
| 1993 | |
| 1994 | |
| 1995 | 24063 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 30287 |
| 2000 | 28800 |
| 2001 | 29007 |
| 2002 | 29331 |
| 2003 | 29617 |
| 2004 | 30252 |
| 2005 | 30419 |
| 2006 | 30453 |
| 2007 | 29031 |
| 2008 | 22832 |
| 2009 | 23376 |
| 2010 | 22226 |
| 2011 | 22541 |
| 2012 | 23360 |
| 2013 | 23917 |
| 2014 | 23688 |
| 2015 | 23401 |
| 2016 | 22270 |