Year | Value | 2021 | 69.629 | 2020 | 72.126 | 2019 | 72.835 | 2018 | 74.128 | 2017 | 74.305 | 2016 | 74.28 | 2015 | 74.407 | 2014 | 74.473 | 2013 | 73.798 | 2012 | 74.146 | 2011 | 74.596 | 2010 | 74.718 | 2009 | 75.083 | 2008 | 75.053 | 2007 | 74.703 | 2006 | 74.017 | 2005 | 73.516 | 2004 | 73.035 | 2003 | 72.352 | 2002 | 72.168 | 2001 | 71.938 | 2000 | 71.377 | 1999 | 71.3 | 1998 | 71.097 | 1997 | 70.922 | 1996 | 71.266 | 1995 | 72.097 | 1994 | 71.922 | 1993 | 72.458 | 1992 | 72.624 | 1991 | 72.937 | 1990 | 72.38 | 1989 | 72.732 | 1988 | 72.35 | 1987 | 72.046 | 1986 | 71.639 | 1985 | 71.521 | 1984 | 71.188 | 1983 | 70.959 | 1982 | 70.433 | 1981 | 70.376 | 1980 | 70.184 | 1979 | 69.752 | 1978 | 69.586 | 1977 | 69.676 | 1976 | 69.391 | 1975 | 69.367 | 1974 | 69.079 | 1973 | 68.583 | 1972 | 68.499 | 1971 | 68.733 | 1970 | 68.57 | 1969 | 68.178 | 1968 | 67.527 | 1967 | 66.666 | 1966 | 65.651 | 1965 | 64.264 | 1964 | 62.667 | 1963 | 61.063 | 1962 | 59.482 | 1961 | 57.932 | 1960 | 56.443 |
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