| 年度 | 实际值 |
|---|---|
| 1992 | 1596 |
| 1993 | |
| 1994 | |
| 1995 | 2013 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 8774 |
| 2000 | 10138 |
| 2001 | 11025 |
| 2002 | 12589 |
| 2003 | 11878 |
| 2004 | 11565 |
| 2005 | 11095 |
| 2006 | 10023 |
| 2007 | 53000 |
| 2008 | 52000 |
| 2009 | 441 |
| 2010 | 1705 |
| 2011 | 2721 |
| 2012 | 2794 |
| 2013 | 2073 |
| 2014 | 2042 |
| 2015 | 3224 |
| 2016 | 4104 |
| 2017 | 24205 |