| 年度 | 实际值 |
|---|---|
| 1992 | 17156 |
| 1993 | |
| 1994 | |
| 1995 | 18373 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 20934 |
| 2000 | 20380 |
| 2001 | 19872 |
| 2002 | 19638 |
| 2003 | 18150 |
| 2004 | 17897 |
| 2005 | 18342 |
| 2006 | 17438 |
| 2007 | 17470 |
| 2008 | 13660 |
| 2009 | 14134 |
| 2010 | 14290 |
| 2011 | 14554 |
| 2012 | 14651 |
| 2013 | 14417 |
| 2014 | 14786 |
| 2015 | 15095 |
| 2016 | 14220 |