| 年度 | 实际值 |
|---|---|
| 1992 | 43 |
| 1993 | |
| 1994 | |
| 1995 | 43.2 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 43.4 |
| 2000 | 43.47 |
| 2001 | 43.52 |
| 2002 | 43.51 |
| 2003 | 43.38 |
| 2004 | 43.41 |
| 2005 | 43.44 |
| 2006 | 43.46 |
| 2007 | 43.55 |
| 2008 | 43.56 |
| 2009 | 43.59 |
| 2010 | 43.65 |
| 2011 | 43.77 |
| 2012 | 43.91 |
| 2013 | 43.94 |
| 2014 | 43.9 |
| 2015 | 43.69 |
| 2016 | 43.5814 |
| 2017 | 44 |