Year | Value | 2021 | 78.497 | 2020 | 78.841 | 2019 | 78.691 | 2018 | 78.511 | 2017 | 78.268 | 2016 | 78.152 | 2015 | 77.913 | 2014 | 77.858 | 2013 | 77.583 | 2012 | 77.35 | 2011 | 77.104 | 2010 | 76.82 | 2009 | 76.669 | 2008 | 76.41 | 2007 | 76.131 | 2006 | 75.765 | 2005 | 75.825 | 2004 | 75.672 | 2003 | 75.478 | 2002 | 75.536 | 2001 | 75.078 | 2000 | 74.606 | 1999 | 74.347 | 1998 | 74.041 | 1997 | 73.96 | 1996 | 73.829 | 1995 | 73.636 | 1994 | 73.591 | 1993 | 73.482 | 1992 | 73.417 | 1991 | 73.435 | 1990 | 73.492 | 1989 | 73.416 | 1988 | 73.53 | 1987 | 73.554 | 1986 | 73.556 | 1985 | 73.566 | 1984 | 73.524 | 1983 | 73.471 | 1982 | 73.458 | 1981 | 73.338 | 1980 | 73.183 | 1979 | 73.035 | 1978 | 72.871 | 1977 | 72.546 | 1976 | 72.359 | 1975 | 71.977 | 1974 | 71.747 | 1973 | 71.349 | 1972 | 71.016 | 1971 | 70.683 | 1970 | 70.058 | 1969 | 69.535 | 1968 | 68.671 | 1967 | 67.859 | 1966 | 66.956 | 1965 | 66.026 | 1964 | 65.058 | 1963 | 64.101 | 1962 | 63.192 | 1961 | 62.363 | 1960 | 61.55 |
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