| 年度 | 实际值 |
|---|---|
| 1993 | 3083 |
| 1994 | 780 |
| 1995 | 3078 |
| 1996 | 2904 |
| 1997 | 2334 |
| 1998 | 2265 |
| 1999 | 2298 |
| 2000 | 2495 |
| 2001 | 2574 |
| 2002 | 2512 |
| 2003 | 2350 |
| 2004 | 2208 |
| 2005 | 2254 |
| 2006 | 2059 |
| 2007 | 2373 |
| 2008 | 2805 |
| 2009 | |
| 2010 | 2141 |
| 2011 | 3042 |
| 2012 | 2430 |
| 2013 | 2517 |
| 2014 | 2683 |
| 2015 | 2777 |
| 2016 | 3832 |
| 2017 | 4159 |
| 2018 | 4261 |