Year | Value | 2021 | 71.157529037325 | 2020 | 71.340049187782 | 2019 | 72.422998801306 | 2018 | 71.718520233125 | 2017 | 72.195066754846 | 2016 | 71.714883644029 | 2015 | 70.83867234324 | 2014 | 71.227214483528 | 2013 | 71.302442855371 | 2012 | 71.020543132311 | 2011 | 70.946141445873 | 2010 | 71.194147067334 | 2009 | 71.611623196792 | 2008 | 73.095523498533 | 2007 | 72.942586698632 | 2006 | 73.732071260282 | 2005 | 70.086388624809 | 2004 | 70.479064192122 | 2003 | 70.086388624809 | 2002 | 70.169057165296 | 2001 | 70.073988343736 | 2000 | 70.119456041004 | 1999 | 71.173479932212 | 1998 | 72.409374612491 | 1997 | 72.686314223122 | 1996 | 72.310172363907 | 1995 | 71.834828256107 | 1994 | 71.958831066838 | 1993 | 72.475509444881 | 1992 | 74.69102632993 | 1991 | 74.992766502707 | 1990 | 75.240772124168 | 1989 | 75.666515107676 | 1988 | 76.150126069524 | 1987 | 74.88116397305 | 1986 | 74.939031951391 | 1985 | 75.096102178316 | 1984 | 75.236638697144 | 1983 | 75.294506675485 | 1982 | 75.563179432067 | 1981 | 75.724383086017 | 1980 | 76.340263712644 | 1979 | 76.26999545323 | 1978 | 76.377464555863 | 1977 | 76.427065680155 | 1976 | 76.749472988054 | 1975 | 76.81147439342 | 1974 | 77.038812879759 | 1973 | 77.278551647171 | 1972 | 77.526557268631 | 1971 | 77.88616541975 | 1970 | 77.910965981896 | 1969 | 80.105815731823 | 1968 | 80.295953374943 | 1967 | 80.825032034059 | 1966 | 80.808498325962 | 1965 | 80.953168271814 | 1964 | 81.440912660687 | 1963 | 81.622783449758 | 1962 | 81.755053114537 | 1961 | 81.841855082048 |
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