| 年度 | 实际值 |
|---|---|
| 1993 | 22000 |
| 1994 | 22700 |
| 1995 | 23100 |
| 1996 | 20000 |
| 1997 | 19900 |
| 1998 | 19500 |
| 1999 | |
| 2000 | 17400 |
| 2001 | 19700 |
| 2002 | 14712 |
| 2003 | 13338 |
| 2004 | 12370 |
| 2005 | 11805 |
| 2006 | 11413 |
| 2007 | 11371 |
| 2008 | 11217 |
| 2009 | 11085 |
| 2010 | 11042 |
| 2011 | 11175 |
| 2012 | 11184 |
| 2013 | 11256 |
| 2014 | 12977 |
| 2015 | 11989 |
| 2016 | 12051 |
| 2017 | 11909 |