| 年度 | 实际值 |
|---|---|
| 1990 | 4208 |
| 1991 | 4772 |
| 1992 | 5897 |
| 1993 | 5871 |
| 1994 | 5293 |
| 1995 | 5923 |
| 1996 | 6505 |
| 1997 | 7192 |
| 1998 | 8404 |
| 1999 | 6801 |
| 2000 | 5898 |
| 2001 | 23945 |
| 2002 | 23464 |
| 2003 | 23341 |
| 2004 | 25071 |
| 2005 | 24625 |
| 2006 | 25083 |
| 2007 | 28204 |
| 2008 | 29570 |
| 2009 | 30639 |
| 2010 | 35932 |
| 2011 | 39218 |
| 2012 | 36698 |
| 2013 | 36957 |
| 2014 | 36541 |
| 2015 | 28000 |