Year | Value | 2021 | 73.108 | 2020 | 74.04 | 2019 | 75.208 | 2018 | 75.034 | 2017 | 74.849 | 2016 | 74.775 | 2015 | 74.18 | 2014 | 73.539 | 2013 | 73.945 | 2012 | 74.406 | 2011 | 74.492 | 2010 | 74.341 | 2009 | 74.067 | 2008 | 73.892 | 2007 | 73.201 | 2006 | 73.174 | 2005 | 72.36 | 2004 | 73.357 | 2003 | 72.806 | 2002 | 72.21 | 2001 | 71.932 | 2000 | 71.484 | 1999 | 72.039 | 1998 | 71.197 | 1997 | 70.753 | 1996 | 70.413 | 1995 | 66.256 | 1994 | 60.361 | 1993 | 43.012 | 1992 | 43.494 | 1991 | 68.821 | 1990 | 69.211 | 1989 | 69.01 | 1988 | 68.918 | 1987 | 68.957 | 1986 | 68.221 | 1985 | 67.957 | 1984 | 67.842 | 1983 | 67.588 | 1982 | 67.444 | 1981 | 67.296 | 1980 | 67.134 | 1979 | 67.057 | 1978 | 66.825 | 1977 | 66.772 | 1976 | 66.463 | 1975 | 66.25 | 1974 | 65.763 | 1973 | 65.144 | 1972 | 64.502 | 1971 | 64.076 | 1970 | 63.656 | 1969 | 63.244 | 1968 | 63.033 | 1967 | 62.798 | 1966 | 62.495 | 1965 | 61.878 | 1964 | 61.257 | 1963 | 60.661 | 1962 | 59.877 | 1961 | 59.243 | 1960 | 58.367 |
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