Year | Value | 2021 | 73.875 | 2020 | 74.832 | 2019 | 76.103 | 2018 | 76.195 | 2017 | 75.971 | 2016 | 75.6 | 2015 | 75.124 | 2014 | 74.782 | 2013 | 74.449 | 2012 | 74.186 | 2011 | 73.679 | 2010 | 73.069 | 2009 | 72.698 | 2008 | 72.624 | 2007 | 72.772 | 2006 | 72.276 | 2005 | 71.838 | 2004 | 71.37 | 2003 | 69.823 | 2002 | 70.445 | 2001 | 69.955 | 2000 | 69.691 | 1999 | 69.297 | 1998 | 68.73 | 1997 | 68.359 | 1996 | 68.07 | 1995 | 67.785 | 1994 | 67.468 | 1993 | 67.139 | 1992 | 66.776 | 1991 | 66.459 | 1990 | 64.367 | 1989 | 65.718 | 1988 | 63.446 | 1987 | 62.823 | 1986 | 62.487 | 1985 | 61.893 | 1984 | 61.22 | 1983 | 58.748 | 1982 | 57.734 | 1981 | 56.715 | 1980 | 58.537 | 1979 | 58.55 | 1978 | 55.926 | 1977 | 56.577 | 1976 | 55.7 | 1975 | 54.761 | 1974 | 53.854 | 1973 | 52.946 | 1972 | 51.659 | 1971 | 51.124 | 1970 | 50.204 | 1969 | 49.438 | 1968 | 48.136 | 1967 | 48.034 | 1966 | 47.421 | 1965 | 46.744 | 1964 | 46.196 | 1963 | 45.619 | 1962 | 44.269 | 1961 | 44.55 | 1960 | 43.957 |
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