Year | Value | 2021 | 71.959 | 2020 | 71.802 | 2019 | 71.9 | 2018 | 71.737 | 2017 | 71.577 | 2016 | 71.427 | 2015 | 71.237 | 2014 | 70.94 | 2013 | 70.934 | 2012 | 70.899 | 2011 | 70.775 | 2010 | 70.637 | 2009 | 70.424 | 2008 | 70.422 | 2007 | 70.005 | 2006 | 70.237 | 2005 | 70.148 | 2004 | 70.073 | 2003 | 69.991 | 2002 | 69.919 | 2001 | 69.856 | 2000 | 69.774 | 1999 | 69.685 | 1998 | 69.583 | 1997 | 69.478 | 1996 | 69.365 | 1995 | 69.246 | 1994 | 69.118 | 1993 | 68.944 | 1992 | 68.829 | 1991 | 68.703 | 1990 | 68.606 | 1989 | 68.455 | 1988 | 68.302 | 1987 | 68.148 | 1986 | 66.93 | 1985 | 67.735 | 1984 | 67.417 | 1983 | 67.173 | 1982 | 66.886 | 1981 | 66.497 | 1980 | 66.052 | 1979 | 65.585 | 1978 | 64.966 | 1977 | 63.721 | 1976 | 63.572 | 1975 | 60.304 | 1974 | 61.794 | 1973 | 60.84 | 1972 | 59.883 | 1971 | 58.944 | 1970 | 57.925 | 1969 | 56.923 | 1968 | 55.923 | 1967 | 54.838 | 1966 | 54.105 | 1965 | 53.304 | 1964 | 52.56 | 1963 | 51.772 | 1962 | 50.989 | 1961 | 50.236 | 1960 | 49.658 |
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