Year | Value | 2021 | 76.301 | 2020 | 77.26 | 2019 | 77.205 | 2018 | 77.247 | 2017 | 69.647 | 2016 | 73.019 | 2015 | 71.082 | 2014 | 72.118 | 2013 | 71.31 | 2012 | 73.215 | 2011 | 72.974 | 2010 | 74.889 | 2009 | 74.726 | 2008 | 76.214 | 2007 | 74.739 | 2006 | 76.113 | 2005 | 75.529 | 2004 | 74.462 | 2003 | 73.838 | 2002 | 75.389 | 2001 | 74.493 | 2000 | 75.051 | 1999 | 73.165 | 1998 | 73.797 | 1997 | 74.074 | 1996 | 74.479 | 1995 | 74.438 | 1994 | 73.542 | 1993 | 73.856 | 1992 | 73.616 | 1991 | 71.873 | 1990 | 72.51 | 1989 | 72.599 | 1988 | 74.479 | 1987 | 74.068 | 1986 | 74.497 | 1985 | 72.449 | 1984 | 72.923 | 1983 | 74.828 | 1982 | 74.488 | 1981 | 75.204 | 1980 | 74.263 | 1979 | 73.038 | 1978 | 72.793 | 1977 | 70.725 | 1976 | 71.827 | 1975 | 71.805 | 1974 | 70.635 | 1973 | 69.958 | 1972 | 69.284 | 1971 | 65.194 | 1970 | 67.231 | 1969 | 64.837 | 1968 | 65.539 | 1967 | 67.017 | 1966 | 65.928 | 1965 | 65.986 | 1964 | 65.86 | 1963 | 59.459 | 1962 | 62.569 | 1961 | 61.095 | 1960 | 59.926 |
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