Year | Value | 2021 | 69.744 | 2020 | 70.982 | 2019 | 72.597 | 2018 | 72.403 | 2017 | 71.898 | 2016 | 71.751 | 2015 | 71.629 | 2014 | 71.466 | 2013 | 71.346 | 2012 | 70.78 | 2011 | 70.571 | 2010 | 70.434 | 2009 | 70.417 | 2008 | 69.939 | 2007 | 69.929 | 2006 | 69.812 | 2005 | 69.294 | 2004 | 67.113 | 2003 | 69.242 | 2002 | 68.696 | 2001 | 68.509 | 2000 | 67.975 | 1999 | 67.982 | 1998 | 67.458 | 1997 | 67.343 | 1996 | 66.867 | 1995 | 66.794 | 1994 | 66.368 | 1993 | 66.301 | 1992 | 65.627 | 1991 | 65.015 | 1990 | 64.792 | 1989 | 64.309 | 1988 | 63.803 | 1987 | 63.435 | 1986 | 63.338 | 1985 | 62.868 | 1984 | 62.325 | 1983 | 62.049 | 1982 | 61.42 | 1981 | 60.848 | 1980 | 60.609 | 1979 | 60.005 | 1978 | 59.507 | 1977 | 59.097 | 1976 | 58.485 | 1975 | 57.861 | 1974 | 57.299 | 1973 | 56.744 | 1972 | 56.125 | 1971 | 55.505 | 1970 | 54.873 | 1969 | 54.195 | 1968 | 53.45 | 1967 | 52.837 | 1966 | 50.174 | 1965 | 46.589 | 1964 | 50.851 | 1963 | 49.829 | 1962 | 49.225 | 1961 | 48.545 | 1960 | 47.933 |
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