| 年度 | 实际值 |
|---|---|
| 1992 | 20875 |
| 1993 | |
| 1994 | |
| 1995 | 17800 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 16772 |
| 2000 | 16843 |
| 2001 | 25295 |
| 2002 | 23098 |
| 2003 | 22394 |
| 2004 | 22871 |
| 2005 | 24680 |
| 2006 | 24652 |
| 2007 | 23959 |
| 2008 | 26423 |
| 2009 | 27547 |
| 2010 | 27218 |
| 2011 | 27459 |
| 2012 | 27898 |
| 2013 | 27802 |
| 2014 | 25005 |
| 2015 | 24845 |
| 2016 | 23859 |