| 年度 | 实际值 |
|---|---|
| 1993 | 512 |
| 1994 | 679 |
| 1995 | 1790 |
| 1996 | 1852 |
| 1997 | 1925 |
| 1998 | 2117 |
| 1999 | 2341 |
| 2000 | |
| 2001 | |
| 2002 | |
| 2003 | 4917 |
| 2004 | 7920 |
| 2005 | 8400 |
| 2006 | 7985 |
| 2007 | 8676 |
| 2008 | 12475 |
| 2009 | |
| 2010 | 13005 |
| 2011 | 14112 |
| 2012 | 20904 |
| 2013 | 21315 |
| 2014 | 21596 |
| 2015 | 22133 |
| 2016 | 22183 |
| 2017 | 22358 |
| 2018 | 22518 |