| 年度 | 实际值 |
|---|---|
| 1986 | 7340 |
| 1987 | 6973 |
| 1988 | 6600 |
| 1989 | 7087 |
| 1990 | 7373 |
| 1991 | 7100 |
| 1992 | 5710 |
| 1993 | 4780 |
| 1994 | 4160 |
| 1995 | 4010 |
| 1996 | 3950 |
| 1997 | 3760 |
| 1998 | 3393 |
| 1999 | 3060 |
| 2000 | 2227 |
| 2001 | 6749 |
| 2002 | 5916 |
| 2003 | 5296 |
| 2004 | 5219 |
| 2005 | 5046 |
| 2006 | 4909 |
| 2007 | 4959 |
| 2008 | 5030 |
| 2009 | 5327 |
| 2010 | 5271 |
| 2011 | 5312 |
| 2012 | 5375 |
| 2013 | 5639 |
| 2014 | 5267 |
| 2015 | 5319 |