Year | Value | 2023 | 69.178062831786 | 2022 | 69.353400424886 | 2021 | 69.534823005944 | 2020 | 69.722908375092 | 2019 | 69.952810878651 | 2018 | 70.221141425284 | 2017 | 70.492670287781 | 2016 | 70.774692712455 | 2015 | 71.072398599558 | 2014 | 71.387618604947 | 2013 | 71.718861172962 | 2012 | 72.064608655842 | 2011 | 72.425090712117 | 2010 | 72.803085582009 | 2009 | 72.794572109054 | 2008 | 72.184080409977 | 2007 | 71.196248899981 | 2006 | 69.975917308062 | 2005 | 69.035758759708 | 2004 | 68.708692149602 | 2003 | 68.625255445014 | 2002 | 68.534794855318 | 2001 | 68.433077663759 | 2000 | 68.316351345039 | 1999 | 68.181954652738 | 1998 | 68.025592835649 | 1997 | 67.840942071338 | 1996 | 67.622394067014 | 1995 | 67.446470566001 | 1994 | 67.342371740266 | 1993 | 67.242511527992 | 1992 | 67.139220623835 | 1991 | 67.030292528865 | 1990 | 66.913734750554 | 1989 | 66.785204036075 | 1988 | 66.640177088178 | 1987 | 66.474523592416 | 1986 | 66.284196127588 | 1985 | 66.484745595621 | 1984 | 67.173062474252 | 1983 | 67.966389026255 | 1982 | 68.846672877478 | 1981 | 69.818847824901 | 1980 | 70.443213733472 | 1979 | 70.630589178074 | 1978 | 70.77347990825 | 1977 | 70.837265035134 | 1976 | 70.753870626871 | 1975 | 70.516972951486 | 1974 | 70.195444705308 |
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