Year | Value | 2021 | 80.162 | 2020 | 78.041 | 2019 | 79.063 | 2018 | 79.77 | 2017 | 79.258 | 2016 | 80.27 | 2015 | 79.695 | 2014 | 78.929 | 2013 | 78.777 | 2012 | 78.461 | 2011 | 78.316 | 2010 | 78.01 | 2009 | 77.877 | 2008 | 77.841 | 2007 | 77.621 | 2006 | 77.415 | 2005 | 77.237 | 2004 | 77.143 | 2003 | 76.874 | 2002 | 76.728 | 2001 | 76.456 | 2000 | 75.977 | 1999 | 75.536 | 1998 | 75.194 | 1997 | 74.92 | 1996 | 74.585 | 1995 | 74.364 | 1994 | 74.083 | 1993 | 74.029 | 1992 | 73.939 | 1991 | 73.913 | 1990 | 73.89 | 1989 | 73.853 | 1988 | 73.852 | 1987 | 73.839 | 1986 | 73.718 | 1985 | 73.083 | 1984 | 73.531 | 1983 | 73.484 | 1982 | 73.524 | 1981 | 73.36 | 1980 | 73.226 | 1979 | 73.04 | 1978 | 72.816 | 1977 | 72.616 | 1976 | 72.262 | 1975 | 71.92 | 1974 | 71.634 | 1973 | 71.581 | 1972 | 71.302 | 1971 | 71.198 | 1970 | 71.048 | 1969 | 70.999 | 1968 | 70.679 | 1967 | 70.539 | 1966 | 70.248 | 1965 | 69.991 | 1964 | 69.693 | 1963 | 69.477 | 1962 | 69.284 | 1961 | 69.262 | 1960 | 68.934 |
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