Year | Value | 2021 | 70.47 | 2020 | 72.854 | 2019 | 73.931 | 2018 | 73.703 | 2017 | 73.562 | 2016 | 73.399 | 2015 | 73.187 | 2014 | 73.311 | 2013 | 73.666 | 2012 | 73.245 | 2011 | 72.651 | 2010 | 72.272 | 2009 | 71.819 | 2008 | 71.151 | 2007 | 70.655 | 2006 | 70.093 | 2005 | 69.376 | 2004 | 69.227 | 2003 | 68.909 | 2002 | 68.752 | 2001 | 68.357 | 2000 | 68.564 | 1999 | 68.773 | 1998 | 68.599 | 1997 | 69.212 | 1996 | 69.806 | 1995 | 69.887 | 1994 | 70.316 | 1993 | 69.988 | 1992 | 69.979 | 1991 | 70.248 | 1990 | 70.744 | 1989 | 70.724 | 1988 | 70.781 | 1987 | 70.198 | 1986 | 69.704 | 1985 | 69.462 | 1984 | 68.64 | 1983 | 68.14 | 1982 | 67.955 | 1981 | 68.068 | 1980 | 67.756 | 1979 | 67.399 | 1978 | 66.885 | 1977 | 66.518 | 1976 | 66.268 | 1975 | 65.942 | 1974 | 65.03 | 1973 | 64.622 | 1972 | 64.453 | 1971 | 64.204 | 1970 | 63.468 | 1969 | 62.77 | 1968 | 62.192 | 1967 | 61.5 | 1966 | 60.963 | 1965 | 60.629 | 1964 | 60.057 | 1963 | 59.569 | 1962 | 59 | 1961 | 53.356 | 1960 | 58.163 |
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