| 年度 | 实际值 |
|---|---|
| 1992 | 21864 |
| 1993 | |
| 1994 | |
| 1995 | 23041 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 24432 |
| 2000 | 23690 |
| 2001 | 23567 |
| 2002 | 23431 |
| 2003 | 22618 |
| 2004 | 22697 |
| 2005 | 23128 |
| 2006 | 23504 |
| 2007 | 20961 |
| 2008 | 20253 |
| 2009 | 20543 |
| 2010 | 19973 |
| 2011 | 20292 |
| 2012 | 21088 |
| 2013 | 21482 |
| 2014 | 21217 |
| 2015 | 21300.53 |
| 2016 | 20765 |