| 年度 | 实际值 |
|---|---|
| 1992 | 17560 |
| 1993 | |
| 1994 | |
| 1995 | 18181 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 19900 |
| 2000 | 20230 |
| 2001 | 20068 |
| 2002 | 19865 |
| 2003 | 17449 |
| 2004 | 19262 |
| 2005 | 19066 |
| 2006 | 20253 |
| 2007 | 18827 |
| 2008 | 16667 |
| 2009 | 17077 |
| 2010 | 16908 |
| 2011 | 17334 |
| 2012 | 17299 |
| 2013 | 17390 |
| 2014 | 17494 |
| 2015 | 17508 |
| 2016 | 17090 |