Year | Value | 2021 | 75.57119341209 | 2020 | 75.9688903276 | 2019 | 76.03665735078 | 2018 | 75.835693281866 | 2017 | 75.415733394393 | 2016 | 75.353120481165 | 2015 | 75.152146465206 | 2014 | 74.92772481256 | 2013 | 74.6738496804 | 2012 | 74.430579247193 | 2011 | 74.187044094634 | 2010 | 73.919988700282 | 2009 | 73.699420249405 | 2008 | 73.150656592181 | 2007 | 73.203660265245 | 2006 | 72.955523888912 | 2005 | 72.597369270365 | 2004 | 72.059917455124 | 2003 | 71.979469605854 | 2002 | 71.638676767097 | 2001 | 71.28838264782 | 2000 | 70.692462220594 | 1999 | 70.316301150139 | 1998 | 70.099069959234 | 1997 | 69.673338456476 | 1996 | 69.278857532932 | 1995 | 69.021118289209 | 1994 | 68.589387568567 | 1993 | 68.304787233241 | 1992 | 67.841158371977 | 1991 | 67.319513833555 | 1990 | 67.096105125835 | 1989 | 66.878163889661 | 1988 | 66.553374755234 | 1987 | 66.274356210586 | 1986 | 65.924605593295 | 1985 | 65.578534309917 | 1984 | 65.198912488575 | 1983 | 64.805670168375 | 1982 | 64.385810236631 | 1981 | 63.902952300063 | 1980 | 63.402112300107 | 1979 | 62.849371083702 | 1978 | 62.230442711511 | 1977 | 61.59720343923 | 1976 | 60.841572720961 | 1975 | 60.003750392832 | 1974 | 59.239780044558 | 1973 | 58.593833293954 | 1972 | 57.632912779973 | 1971 | 57.034450530079 | 1970 | 56.178378794284 | 1969 | 55.465672487675 | 1968 | 54.759095629249 | 1967 | 54.282246568903 | 1966 | 53.406583066674 | 1965 | 52.225977630953 | 1964 | 52.307699908621 | 1963 | 51.577645430537 | 1962 | 51.07517555209 | 1961 | 43.208667192556 | 1960 | 37.539508467919 |
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