| 年度 | 实际值 |
|---|---|
| 1993 | 25000 |
| 1994 | 23900 |
| 1995 | 23000 |
| 1996 | 20000 |
| 1997 | 20800 |
| 1998 | 19200 |
| 1999 | |
| 2000 | 16456 |
| 2001 | 14656 |
| 2002 | 13485 |
| 2003 | 12367 |
| 2004 | 10868 |
| 2005 | 9269 |
| 2006 | 8356 |
| 2007 | 7596 |
| 2008 | 7323 |
| 2009 | 7075 |
| 2010 | 7193 |
| 2011 | 7210 |
| 2012 | 7169 |
| 2013 | 7536 |
| 2014 | 7843 |
| 2015 | 7495 |
| 2016 | 8513 |
| 2017 | 8702 |