Year | Value | 2022 | 81.621216544042 | 2021 | 81.377013287 | 2020 | 81.134569998157 | 2019 | 80.888855597617 | 2018 | 80.650708165812 | 2017 | 80.414453127621 | 2016 | 80.165783121856 | 2015 | 79.910080677138 | 2014 | 79.649596077773 | 2013 | 79.386334214571 | 2012 | 79.120508810017 | 2011 | 78.848940683853 | 2010 | 78.569049608623 | 2009 | 78.293132639354 | 2008 | 78.010010260476 | 2007 | 77.719686901895 | 2006 | 77.422952908964 | 2005 | 77.122455010619 | 2004 | 76.819130833246 | 2003 | 76.511023302942 | 2002 | 76.189925087131 | 2001 | 75.860725141935 | 2000 | 75.502367695835 | 1999 | 75.053403977135 | 1998 | 74.599139264303 | 1997 | 74.128441701928 | 1996 | 73.652440513396 | 1995 | 73.185240362813 | 1994 | 72.696158093173 | 1993 | 72.202196902616 | 1992 | 71.714510126599 | 1991 | 71.215050766035 | 1990 | 70.692731773522 | 1989 | 70.134592360488 | 1988 | 69.561221613017 | 1987 | 68.976210140648 | 1986 | 68.382275722208 | 1985 | 67.775777555224 | 1984 | 67.153639376545 | 1983 | 66.523926573183 | 1982 | 65.886379118827 | 1981 | 65.227811902076 | 1980 | 64.535274455973 | 1979 | 63.825104825178 | 1978 | 63.11278892062 | 1977 | 62.393460223665 | 1976 | 61.671968551804 | 1975 | 60.950344129164 | 1974 | 60.224583409169 | 1973 | 59.498249706948 | 1972 | 58.766500520251 | 1971 | 58.01221650157 | 1970 | 57.251068003152 | 1969 | 56.495279293456 | 1968 | 55.733428026518 | 1967 | 54.967038578719 | 1966 | 54.201588828591 | 1965 | 53.435262897819 | 1964 | 52.668606062821 | 1963 | 51.847306624078 | 1962 | 51.030865406013 | 1961 | 50.217597453424 | 1960 | 49.416929544477 |
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