| 年度 | 实际值 |
|---|---|
| 1992 | 40.4 |
| 1993 | |
| 1994 | |
| 1995 | 41.5 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 42.3 |
| 2000 | 42.4 |
| 2001 | 42.36 |
| 2002 | 42.38 |
| 2003 | 42.34 |
| 2004 | 42.41 |
| 2005 | 42.47 |
| 2006 | 42.36 |
| 2007 | 42.53 |
| 2008 | 42.68 |
| 2009 | 42.85 |
| 2010 | 43 |
| 2011 | 43.17 |
| 2012 | 43.26 |
| 2013 | 43.57 |
| 2014 | 43.7 |
| 2015 | 43.7 |
| 2016 | 43.8787 |
| 2017 | 44 |