Year | Value | 2021 | 74.042 | 2020 | 73.92 | 2019 | 74.27 | 2018 | 73.986 | 2017 | 73.66 | 2016 | 73.284 | 2015 | 72.92 | 2014 | 72.538 | 2013 | 72.122 | 2012 | 71.679 | 2011 | 71.269 | 2010 | 70.829 | 2009 | 70.458 | 2008 | 70.048 | 2007 | 69.604 | 2006 | 69.128 | 2005 | 68.704 | 2004 | 68.231 | 2003 | 67.915 | 2002 | 67.547 | 2001 | 67.18 | 2000 | 66.787 | 1999 | 66.406 | 1998 | 66.018 | 1997 | 65.629 | 1996 | 65.238 | 1995 | 64.736 | 1994 | 64.346 | 1993 | 63.872 | 1992 | 63.401 | 1991 | 62.946 | 1990 | 62.448 | 1989 | 61.899 | 1988 | 61.32 | 1987 | 60.711 | 1986 | 60.041 | 1985 | 59.286 | 1984 | 58.49 | 1983 | 57.724 | 1982 | 56.897 | 1981 | 56.036 | 1980 | 55.219 | 1979 | 54.351 | 1978 | 53.499 | 1977 | 52.704 | 1976 | 51.936 | 1975 | 51.244 | 1974 | 50.673 | 1973 | 50.171 | 1972 | 49.719 | 1971 | 49.243 | 1970 | 48.807 | 1969 | 48.315 | 1968 | 47.778 | 1967 | 47.19 | 1966 | 46.562 | 1965 | 45.973 | 1964 | 45.392 | 1963 | 44.82 | 1962 | 44.297 | 1961 | 43.795 | 1960 | 42.017 |
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