| 年度 | 实际值 |
|---|---|
| 1992 | 16000 |
| 1993 | |
| 1994 | |
| 1995 | 16000 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 18800 |
| 2000 | 20900 |
| 2001 | 22000 |
| 2002 | 19400 |
| 2003 | 18400 |
| 2004 | 20000 |
| 2005 | 21200 |
| 2006 | 23500 |
| 2007 | 24600 |
| 2008 | 30500 |
| 2009 | 29900 |
| 2010 | 33900 |
| 2011 | 35600 |
| 2012 | 37100 |
| 2013 | 42000 |
| 2014 | 35600 |
| 2015 | 36900 |
| 2016 | 40000 |
| 2017 | 30000 |