Year | Value | 2021 | 72.982 | 2020 | 72.197 | 2019 | 74.164 | 2018 | 73.887 | 2017 | 73.608 | 2016 | 73.339 | 2015 | 73.076 | 2014 | 73.202 | 2013 | 73.272 | 2012 | 73.16 | 2011 | 73.217 | 2010 | 73.576 | 2009 | 74.198 | 2008 | 74.388 | 2007 | 74.381 | 2006 | 74.396 | 2005 | 74.603 | 2004 | 74.462 | 2003 | 73.774 | 2002 | 72.73 | 2001 | 72.435 | 2000 | 71.678 | 1999 | 71.323 | 1998 | 70.846 | 1997 | 70.592 | 1996 | 70.339 | 1995 | 70.399 | 1994 | 70.159 | 1993 | 70.091 | 1992 | 69.725 | 1991 | 69.458 | 1990 | 69.621 | 1989 | 68.986 | 1988 | 68.662 | 1987 | 68.328 | 1986 | 68.054 | 1985 | 67.801 | 1984 | 67.532 | 1983 | 67.292 | 1982 | 67.045 | 1981 | 66.781 | 1980 | 66.581 | 1979 | 66.295 | 1978 | 65.288 | 1977 | 64.596 | 1976 | 63.813 | 1975 | 63.475 | 1974 | 62.839 | 1973 | 62.64 | 1972 | 62.285 | 1971 | 62.379 | 1970 | 61.966 | 1969 | 62.01 | 1968 | 61.524 | 1967 | 61.162 | 1966 | 60.679 | 1965 | 60.877 | 1964 | 61.022 | 1963 | 60.531 | 1962 | 59.943 | 1961 | 59.617 | 1960 | 59.146 |
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