| 年度 | 实际值 |
|---|---|
| 1992 | 30993 |
| 1993 | |
| 1994 | |
| 1995 | 31820 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 35608 |
| 2000 | 32660 |
| 2001 | 31967 |
| 2002 | 31253 |
| 2003 | 28751 |
| 2004 | 29527 |
| 2005 | 30797 |
| 2006 | 31281 |
| 2007 | 31480 |
| 2008 | 27688 |
| 2009 | 28256 |
| 2010 | 28331 |
| 2011 | 28363 |
| 2012 | 28569 |
| 2013 | 28703 |
| 2014 | 27480 |
| 2015 | 27563 |
| 2016 | 26790 |