| 年度 | 实际值 |
|---|---|
| 1993 | 49000 |
| 1994 | 49500 |
| 1995 | 49400 |
| 1996 | 50000 |
| 1997 | 47900 |
| 1998 | 46600 |
| 1999 | 45026 |
| 2000 | 44004 |
| 2001 | 42433 |
| 2002 | 40700 |
| 2003 | 39235 |
| 2004 | 37583 |
| 2005 | 39669 |
| 2006 | 36190 |
| 2007 | 35923 |
| 2008 | 34137 |
| 2009 | 36087 |
| 2010 | 33328 |
| 2011 | 28108 |
| 2012 | 25610 |
| 2013 | 28637 |
| 2014 | 28524 |
| 2015 | 28512 |
| 2016 | 29135 |
| 2017 | 28973 |