Year | Value | 2021 | 77.145 | 2020 | 79.279 | 2019 | 79.379 | 2018 | 79.323 | 2017 | 79.133 | 2016 | 79.078 | 2015 | 78.856 | 2014 | 78.774 | 2013 | 78.811 | 2012 | 78.663 | 2011 | 78.667 | 2010 | 78.56 | 2009 | 78.326 | 2008 | 78.131 | 2007 | 78.052 | 2006 | 77.861 | 2005 | 77.696 | 2004 | 77.29 | 2003 | 77.009 | 2002 | 76.729 | 2001 | 76.446 | 2000 | 76.41 | 1999 | 76.327 | 1998 | 75.991 | 1997 | 75.537 | 1996 | 74.935 | 1995 | 74.52 | 1994 | 74.052 | 1993 | 73.707 | 1992 | 73.082 | 1991 | 73.004 | 1990 | 72.451 | 1989 | 71.849 | 1988 | 71.665 | 1987 | 71.102 | 1986 | 70.441 | 1985 | 69.883 | 1984 | 69.076 | 1983 | 68.492 | 1982 | 67.658 | 1981 | 66.816 | 1980 | 66.124 | 1979 | 65.32 | 1978 | 64.321 | 1977 | 63.086 | 1976 | 61.983 | 1975 | 60.933 | 1974 | 59.795 | 1973 | 58.571 | 1972 | 57.488 | 1971 | 56.13 | 1970 | 54.975 | 1969 | 53.686 | 1968 | 52.829 | 1967 | 51.643 | 1966 | 50.473 | 1965 | 49.758 | 1964 | 48.577 | 1963 | 47.728 | 1962 | 46.651 | 1961 | 45.694 | 1960 | 45.031 |
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