Year | Value | 2021 | 73.618 | 2020 | 75.378 | 2019 | 74.093 | 2018 | 73.976 | 2017 | 73.963 | 2016 | 73.938 | 2015 | 73.876 | 2014 | 73.855 | 2013 | 73.775 | 2012 | 73.704 | 2011 | 73.692 | 2010 | 73.513 | 2009 | 73.498 | 2008 | 73.411 | 2007 | 73.436 | 2006 | 73.319 | 2005 | 73.271 | 2004 | 73.135 | 2003 | 72.98 | 2002 | 72.801 | 2001 | 72.647 | 2000 | 72.462 | 1999 | 72.317 | 1998 | 72.107 | 1997 | 71.802 | 1996 | 71.51 | 1995 | 71.384 | 1994 | 70.759 | 1993 | 70.621 | 1992 | 69.958 | 1991 | 69.849 | 1990 | 69.213 | 1989 | 69.076 | 1988 | 68.469 | 1987 | 68.392 | 1986 | 68.013 | 1985 | 67.601 | 1984 | 67.305 | 1983 | 67.148 | 1982 | 67.106 | 1981 | 66.645 | 1980 | 66.195 | 1979 | 66.001 | 1978 | 65.529 | 1977 | 65.049 | 1976 | 64.775 | 1975 | 62.882 | 1974 | 55.83 | 1973 | 56.786 | 1972 | 53.103 | 1971 | 56.749 | 1970 | 56.222 | 1969 | 56.151 | 1968 | 54.07 | 1967 | 58.161 | 1966 | 58.467 | 1965 | 58.692 | 1964 | 59.323 | 1963 | 58.701 | 1962 | 60.131 | 1961 | 60.261 | 1960 | 59.657 |
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