| 年度 | 实际值 |
|---|---|
| 1993 | 14706 |
| 1994 | 1951 |
| 1995 | 14897 |
| 1996 | 14703 |
| 1997 | 13288 |
| 1998 | 13789 |
| 1999 | 13608 |
| 2000 | 13829 |
| 2001 | 11806 |
| 2002 | 11806 |
| 2003 | 10221 |
| 2004 | 10494 |
| 2005 | 11395 |
| 2006 | 10969 |
| 2007 | 13300 |
| 2008 | 13468 |
| 2009 | |
| 2010 | 14066 |
| 2011 | 15306 |
| 2012 | 14058 |
| 2013 | 16551 |
| 2014 | 15092 |
| 2015 | 18893 |
| 2016 | 20877 |
| 2017 | 20531 |
| 2018 | 21449 |