| 年度 | 实际值 |
|---|---|
| 1993 | 3608 |
| 1994 | |
| 1995 | 3683 |
| 1996 | 3701 |
| 1997 | 2876 |
| 1998 | 2814 |
| 1999 | 2812 |
| 2000 | 4225 |
| 2001 | 2850 |
| 2002 | 2436 |
| 2003 | 2367 |
| 2004 | 2562 |
| 2005 | 3869 |
| 2006 | 3903 |
| 2007 | 4630 |
| 2008 | 4763 |
| 2009 | |
| 2010 | 2240 |
| 2011 | 3048 |
| 2012 | 3102 |
| 2013 | 3400 |
| 2014 | 3498 |
| 2015 | 9356 |
| 2016 | 8608 |
| 2017 | 1972 |
| 2018 | 2011 |