| 年度 | 实际值 |
|---|---|
| 1992 | 39900 |
| 1993 | |
| 1994 | |
| 1995 | 37600 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 38540 |
| 2000 | 35150 |
| 2001 | 31970 |
| 2002 | 29870 |
| 2003 | 25360 |
| 2004 | 23870 |
| 2005 | 24860 |
| 2006 | 24760 |
| 2007 | 24920 |
| 2008 | 26330 |
| 2009 | 28050 |
| 2010 | 28620 |
| 2011 | 29100 |
| 2012 | 29650 |
| 2013 | 30160 |
| 2014 | 23030 |
| 2015 | 23850 |
| 2016 | 24710 |