| 年度 | 实际值 |
|---|---|
| 1992 | 42.7 |
| 1993 | |
| 1994 | |
| 1995 | 42.9 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 41.54 |
| 2000 | 417526 |
| 2001 | 418636 |
| 2002 | 35.3421 |
| 2003 | 35.2299 |
| 2004 | 35.1729 |
| 2005 | 35.0173 |
| 2006 | 35 |
| 2007 | 35.17 |
| 2008 | 35.56 |
| 2009 | 35.9633 |
| 2010 | 35.7291 |
| 2011 | 34.5464 |
| 2012 | 34.78 |
| 2013 | 35.38 |
| 2014 | 36.13 |
| 2015 | 34.43 |
| 2016 | 33.41 |