Year | Value | 2022 | 70.709075565495 | 2021 | 72.991252337952 | 2020 | 73.94303531496 | 2019 | 74.26434917812 | 2018 | 75.105880745643 | 2017 | 75.385050853199 | 2016 | 76.875117545222 | 2015 | 75.219866895053 | 2014 | 73.561335129509 | 2013 | 73.435212316538 | 2012 | 72.455245420601 | 2011 | 72.506486796259 | 2010 | 74.139917708093 | 2009 | 72.354553245059 | 2008 | 73.94587620345 | 2007 | 74.139021857206 | 2006 | 74.34745419349 | 2005 | 75.255067308378 | 2004 | 75.620914049363 | 2003 | 76.150032125194 | 2002 | 75.588343384723 | 2001 | 76.520988066192 | 2000 | 75.904290797587 | 1999 | 76.294412896606 | 1998 | 75.233521145883 | 1997 | 74.869984640673 | 1996 | 75.66416935586 | 1995 | 75.968748361386 | 1994 | 75.985992614833 | 1993 | 77.101937999329 | 1992 | 77.905171863889 | 1991 | 75.319090534791 | 1990 | 72.32730821977 | 1989 | 71.808295431403 | 1988 | 73.381869046005 | 1987 | 75.71633613058 | 1986 | 75.311557230313 | 1985 | 74.15826238349 | 1984 | 75.127991538987 | 1983 | 77.715773023884 | 1982 | 73.80826466959 | 1981 | 73.816274826396 | 1980 | 73.124981428105 | 1979 | 74.009482025414 | 1978 | 75.663918978088 | 1977 | 74.150494267331 | 1976 | 73.65863608005 | 1975 | 72.665777840152 | 1974 | 67.9500347901 | 1973 | 69.030509835407 | 1972 | 68.990055447056 | 1971 | 68.336966214208 | 1970 | 67.245630673351 | 1969 | 68.106738314048 | 1968 | 70.331062343798 | 1967 | 68.742871859019 | 1966 | 70.498728570257 | 1965 | 68.826801190014 | 1964 | 68.683826643452 | 1963 | 69.99272046589 | 1962 | 70.98605801664 | 1961 | 69.278479572095 | 1960 | 68.729308372961 |
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