| 年度 | 实际值 |
|---|---|
| 1993 | 1292 |
| 1994 | 1596 |
| 1995 | 1398 |
| 1996 | 1235 |
| 1997 | 2700 |
| 1998 | 902 |
| 1999 | 1180 |
| 2000 | 1558 |
| 2001 | 1617 |
| 2002 | 1075 |
| 2003 | 1209 |
| 2004 | 1030 |
| 2005 | 1426 |
| 2006 | 1858 |
| 2007 | 2108 |
| 2008 | 2328 |
| 2009 | |
| 2010 | 2395 |
| 2011 | 4527 |
| 2012 | 4862 |
| 2013 | 3422 |
| 2014 | 2030 |
| 2015 | 2231 |
| 2016 | 2988 |
| 2017 | 3057 |
| 2018 | 3171 |