| 年度 | 实际值 |
|---|---|
| 1993 | 1559 |
| 1994 | 1649 |
| 1995 | 1932 |
| 1996 | 1894 |
| 1997 | 3008 |
| 1998 | 1878 |
| 1999 | 1609 |
| 2000 | 1611 |
| 2001 | 1612 |
| 2002 | 1671 |
| 2003 | 1656 |
| 2004 | 1819 |
| 2005 | 1829 |
| 2006 | 1813 |
| 2007 | 1929 |
| 2008 | 4370 |
| 2009 | |
| 2010 | 4435 |
| 2011 | 2571 |
| 2012 | 2746 |
| 2013 | 3089 |
| 2014 | 3247 |
| 2015 | 3341 |
| 2016 | 3404 |
| 2017 | 3765 |
| 2018 | 3918 |