| 年度 | 实际值 |
|---|---|
| 1992 | 37.6 |
| 1993 | |
| 1994 | |
| 1995 | 38.1 |
| 1996 | |
| 1997 | |
| 1998 | |
| 1999 | 38.8 |
| 2000 | 38.89 |
| 2001 | 39.03 |
| 2002 | 39.13 |
| 2003 | 39.28 |
| 2004 | 39.5 |
| 2005 | 39.86 |
| 2006 | 40.23 |
| 2007 | 40.66 |
| 2008 | 41.1 |
| 2009 | 41.47 |
| 2010 | 41.96 |
| 2011 | 42.25 |
| 2012 | 42.55 |
| 2013 | 42.81 |
| 2014 | 43.02 |
| 2015 | 43.02 |
| 2016 | 43.1807 |
| 2017 | 43.4 |
| 2018 | 43.5295 |