| 年度 | 实际值 |
|---|---|
| 1992 | 27800 |
| 1993 | |
| 1994 | |
| 1995 | 28676 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 32688 |
| 2000 | 32270 |
| 2001 | 31414 |
| 2002 | 31205 |
| 2003 | 29971 |
| 2004 | 29483 |
| 2005 | 29239 |
| 2006 | 28926 |
| 2007 | 29474 |
| 2008 | 25491 |
| 2009 | 26064 |
| 2010 | 26176 |
| 2011 | 26335 |
| 2012 | 26308 |
| 2013 | 26420 |
| 2014 | 26609 |
| 2015 | 26580 |
| 2016 | 25635 |