| 年度 | 实际值 |
|---|---|
| 1992 | 41.5 |
| 1993 | |
| 1994 | |
| 1995 | 42 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 42 |
| 2000 | 41.8704 |
| 2001 | 41.817 |
| 2002 | 41.8865 |
| 2003 | 41.9533 |
| 2004 | 43.7982 |
| 2005 | 42.93 |
| 2006 | 42.9 |
| 2007 | 42.99 |
| 2008 | 43.08 |
| 2009 | 43.593 |
| 2010 | 44.9658 |
| 2011 | 46.2157 |
| 2012 | 46.6346 |
| 2013 | 47.1921 |
| 2014 | 42.35 |
| 2015 | 42.47 |
| 2016 | 47 |
| 2017 | 47 |