Year | Value | 2022 | 81.758485046055 | 2021 | 79.637250482621 | 2020 | 78.331633344922 | 2019 | 78.724378578915 | 2018 | 78.64730771974 | 2017 | 79.451368055276 | 2016 | 80.504255861991 | 2015 | 81.050500281254 | 2014 | 82.562300117135 | 2013 | 82.460611527738 | 2012 | 80.611674675882 | 2011 | 81.230742865972 | 2010 | 81.816910477137 | 2009 | 80.502670616015 | 2008 | 80.533936574608 | 2007 | 79.270857276896 | 2006 | 79.166423692577 | 2005 | 81.302973594453 | 2004 | 79.935058604458 | 2003 | 81.14755392454 | 2002 | 79.49733728948 | 2001 | 78.612314992358 | 2000 | 78.046206544744 | 1999 | 76.442110727965 | 1998 | 76.100603167192 | 1997 | 76.732152182715 | 1996 | 76.512969680147 | 1995 | 76.840980824474 | 1994 | 79.214639123421 | 1993 | 79.651394703952 | 1992 | 81.843777674908 | 1991 | 79.912176311238 | 1990 | 78.397537653373 | 1989 | 77.67100733288 | 1988 | 76.690910270971 | 1987 | 70.946485217093 | 1986 | 74.609780692618 | 1985 | 69.685998737756 | 1984 | 68.926952837114 | 1983 | 66.41226403823 | 1982 | 67.825369804417 | 1981 | 71.202077159767 | 1980 | 71.160733152629 | 1979 | 75.299706649283 | 1978 | 76.980329482242 | 1977 | 77.071600865333 | 1976 | 79.086542669584 | 1975 | 79.037872727273 | 1974 | 78.956911111111 | 1973 | 79.65496382055 | 1972 | 80.408088495575 | 1971 | 80.839367346939 | 1970 | 79.226351351351 | 1969 | 79.860172413793 | 1968 | 80.944359673024 | 1967 | 79.827620481928 | 1966 | 79.725921052632 | 1965 | 79.421721611722 | 1964 | 81.146573705179 | 1963 | 81.220283018868 | 1962 | 83.421894736842 | 1961 | 82.59 | 1960 | 82.861901840491 |
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