Year | Value | 2021 | 72.377 | 2020 | 73.665 | 2019 | 76.156 | 2018 | 76.009 | 2017 | 75.879 | 2016 | 75.789 | 2015 | 75.621 | 2014 | 75.333 | 2013 | 74.967 | 2012 | 74.544 | 2011 | 74.133 | 2010 | 73.711 | 2009 | 73.466 | 2008 | 73.377 | 2007 | 73.223 | 2006 | 73.172 | 2005 | 72.986 | 2004 | 72.668 | 2003 | 72.217 | 2002 | 71.661 | 2001 | 71.041 | 2000 | 70.424 | 1999 | 69.743 | 1998 | 69.082 | 1997 | 68.605 | 1996 | 68.147 | 1995 | 67.644 | 1994 | 67.227 | 1993 | 66.681 | 1992 | 66.149 | 1991 | 65.434 | 1990 | 65.106 | 1989 | 64.352 | 1988 | 63.601 | 1987 | 62.804 | 1986 | 62.024 | 1985 | 61.292 | 1984 | 60.467 | 1983 | 60.161 | 1982 | 60.015 | 1981 | 59.847 | 1980 | 59.589 | 1979 | 59.303 | 1978 | 58.973 | 1977 | 58.617 | 1976 | 58.266 | 1975 | 57.905 | 1974 | 57.483 | 1973 | 57.085 | 1972 | 56.737 | 1971 | 56.163 | 1970 | 47.16 | 1969 | 55.255 | 1968 | 54.747 | 1967 | 54.223 | 1966 | 53.699 | 1965 | 53.183 | 1964 | 52.717 | 1963 | 52.2 | 1962 | 51.31 | 1961 | 51.091 | 1960 | 50.495 |
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