| 年度 | 实际值 |
|---|---|
| 1992 | 15039 |
| 1993 | |
| 1994 | |
| 1995 | 19513 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 12063 |
| 2000 | 13568 |
| 2001 | 7791 |
| 2002 | 7791 |
| 2003 | 10228 |
| 2004 | 17325 |
| 2005 | 17068 |
| 2006 | 17655 |
| 2007 | 15472 |
| 2008 | 17691 |
| 2009 | 21659.8 |
| 2010 | 19141 |
| 2011 | 19596.8 |
| 2012 | 20377.1 |
| 2013 | 21217 |
| 2014 | 25085 |
| 2015 | 8396.9 |
| 2016 | 23057 |