Year | Value | 2021 | 75.64 | 2020 | 77.5 | 2019 | 78.6 | 2018 | 78.4 | 2017 | 78.1 | 2016 | 78.3 | 2015 | 77.9 | 2014 | 78 | 2013 | 77.9 | 2012 | 77.5 | 2011 | 77.2 | 2010 | 77 | 2009 | 76.7 | 2008 | 76.6 | 2007 | 76.5 | 2006 | 76.1 | 2005 | 75.6 | 2004 | 75.5 | 2003 | 75.1 | 2002 | 75 | 2001 | 75 | 2000 | 74.4 | 1999 | 72.973 | 1998 | 74.388 | 1997 | 74.719 | 1996 | 74.646 | 1995 | 74.861 | 1994 | 74.457 | 1993 | 74.197 | 1992 | 74.101 | 1991 | 73.885 | 1990 | 73.475 | 1989 | 72.951 | 1988 | 72.678 | 1987 | 72.265 | 1986 | 72.075 | 1985 | 71.981 | 1984 | 71.514 | 1983 | 71.397 | 1982 | 71.806 | 1981 | 71.824 | 1980 | 71.809 | 1979 | 71.543 | 1978 | 71.54 | 1977 | 71.53 | 1976 | 71.11 | 1975 | 70.881 | 1974 | 70.686 | 1973 | 70.073 | 1972 | 69.847 | 1971 | 69.094 | 1970 | 68.617 | 1969 | 68.115 | 1968 | 68.014 | 1967 | 67.623 | 1966 | 67.856 | 1965 | 67.019 | 1964 | 66.639 | 1963 | 66.578 | 1962 | 66.187 | 1961 | 65.552 | 1960 | 65.341 |
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