| 年度 | 实际值 |
|---|---|
| 1992 | 19673 |
| 1993 | |
| 1994 | 21000 |
| 1995 | 21197 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 23360 |
| 2000 | 23321 |
| 2001 | 22996 |
| 2002 | 22900 |
| 2003 | 22160 |
| 2004 | 22367 |
| 2005 | 23198 |
| 2006 | 16899 |
| 2007 | 16996 |
| 2008 | 14541 |
| 2009 | 15650 |
| 2010 | 15817 |
| 2011 | 16269 |
| 2012 | 16652 |
| 2013 | 17190 |
| 2014 | 17577 |
| 2015 | 20125 |
| 2016 | 20322 |