| 年度 | 实际值 |
|---|---|
| 1992 | 26290 |
| 1993 | |
| 1994 | |
| 1995 | 28601 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 35640 |
| 2000 | 36150 |
| 2001 | 34968 |
| 2002 | 35328 |
| 2003 | 29711 |
| 2004 | 28557 |
| 2005 | 28980 |
| 2006 | 26502 |
| 2007 | 25384 |
| 2008 | 17737 |
| 2009 | 18706 |
| 2010 | 18817 |
| 2011 | 20119 |
| 2012 | 20795 |
| 2013 | 21752 |
| 2014 | 22014 |
| 2015 | 21699 |
| 2016 | 21407 |