| 年度 | 实际值 |
|---|---|
| 1992 | 45690 |
| 1993 | |
| 1994 | |
| 1995 | 41960 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 39226 |
| 2000 | 24220 |
| 2001 | 20060 |
| 2002 | 20130 |
| 2003 | 17390 |
| 2004 | 19720 |
| 2005 | 19550 |
| 2006 | 20210 |
| 2007 | 19390 |
| 2008 | 19730 |
| 2009 | 20280 |
| 2010 | 18980 |
| 2011 | 19520 |
| 2012 | 19620 |
| 2013 | 19840 |
| 2014 | 19390 |
| 2015 | 14330 |
| 2016 | 14550 |