Year | Value | 2021 | 79.173 | 2020 | 79.676 | 2019 | 81.666 | 2018 | 81.608 | 2017 | 81.504 | 2016 | 81.377 | 2015 | 81.183 | 2014 | 81.013 | 2013 | 80.781 | 2012 | 80.703 | 2011 | 80.798 | 2010 | 80.688 | 2009 | 80.544 | 2008 | 80.429 | 2007 | 80.247 | 2006 | 79.686 | 2005 | 79.493 | 2004 | 79.237 | 2003 | 79.057 | 2002 | 78.823 | 2001 | 78.618 | 2000 | 78.419 | 1999 | 78.209 | 1998 | 78.021 | 1997 | 77.316 | 1996 | 77.746 | 1995 | 77.511 | 1994 | 77.258 | 1993 | 77.118 | 1992 | 76.972 | 1991 | 76.631 | 1990 | 76.433 | 1989 | 76.076 | 1988 | 75.796 | 1987 | 75.356 | 1986 | 74.9 | 1985 | 74.589 | 1984 | 74.41 | 1983 | 74.147 | 1982 | 73.79 | 1981 | 73.352 | 1980 | 72.986 | 1979 | 71.861 | 1978 | 71.578 | 1977 | 71.352 | 1976 | 70.948 | 1975 | 70.614 | 1974 | 70.074 | 1973 | 69.504 | 1972 | 68.913 | 1971 | 68.136 | 1970 | 67.371 | 1969 | 66.561 | 1968 | 65.645 | 1967 | 64.698 | 1966 | 63.846 | 1965 | 62.866 | 1964 | 61.851 | 1963 | 60.831 | 1962 | 59.75 | 1961 | 58.9 | 1960 | 57.78 |
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