| 年度 | 实际值 |
|---|---|
| 1993 | 2578 |
| 1994 | 2681 |
| 1995 | 2489 |
| 1996 | 2020 |
| 1997 | 1911 |
| 1998 | 2095 |
| 1999 | 2171 |
| 2000 | 2185 |
| 2001 | 2205 |
| 2002 | 2112 |
| 2003 | 2403 |
| 2004 | 2402 |
| 2005 | 2349 |
| 2006 | 1975 |
| 2007 | 2342 |
| 2008 | 2576 |
| 2009 | |
| 2010 | 6979 |
| 2011 | 3679 |
| 2012 | 3917 |
| 2013 | 4060 |
| 2014 | 4096 |
| 2015 | 3980 |
| 2016 | 4035 |
| 2017 | 4428 |
| 2018 | 4491 |