| 年度 | 实际值 |
|---|---|
| 1993 | 2980 |
| 1994 | 1050 |
| 1995 | 2924 |
| 1996 | 2924 |
| 1997 | 4782 |
| 1998 | 1775 |
| 1999 | 1356 |
| 2000 | 1533 |
| 2001 | 1833 |
| 2002 | 1620 |
| 2003 | 2291 |
| 2004 | 2262 |
| 2005 | 1849 |
| 2006 | 1858 |
| 2007 | 1629 |
| 2008 | 1660 |
| 2009 | |
| 2010 | 3071 |
| 2011 | 2540 |
| 2012 | 2540 |
| 2013 | 1620 |
| 2014 | 2337 |
| 2015 | 2186 |
| 2016 | 1969 |
| 2017 | 1958 |
| 2018 | 1965 |