| 年度 | 实际值 |
|---|---|
| 1994 | 20837 |
| 1995 | 21115 |
| 1996 | |
| 1997 | 23603 |
| 1998 | 24423 |
| 1999 | 24680 |
| 2000 | 24519 |
| 2001 | 23827 |
| 2002 | 24519 |
| 2003 | 22655 |
| 2004 | 21883 |
| 2005 | 21245 |
| 2006 | 20715 |
| 2007 | 20387 |
| 2008 | 20005 |
| 2009 | 19633 |
| 2010 | 20060 |
| 2011 | 20004 |
| 2012 | 19997 |
| 2013 | 19874 |
| 2014 | 20087 |
| 2015 | 20229 |
| 2016 | 20671 |