Year | Value | 2021 | 66.072 | 2020 | 66.774 | 2019 | 66.437 | 2018 | 66.251 | 2017 | 65.941 | 2016 | 65.737 | 2015 | 65.298 | 2014 | 64.94 | 2013 | 64.426 | 2012 | 64.009 | 2011 | 63.261 | 2010 | 62.54 | 2009 | 61.958 | 2008 | 61.134 | 2007 | 59.965 | 2006 | 58.714 | 2005 | 57.316 | 2004 | 55.491 | 2003 | 53.368 | 2002 | 51.032 | 2001 | 49.021 | 2000 | 47.129 | 1999 | 44.616 | 1998 | 41.681 | 1997 | 40.64 | 1996 | 40.698 | 1995 | 39.969 | 1994 | 14.098 | 1993 | 42.166 | 1992 | 44.319 | 1991 | 46.519 | 1990 | 48.431 | 1989 | 50.22 | 1988 | 50.976 | 1987 | 51.477 | 1986 | 51.638 | 1985 | 51.734 | 1984 | 51.64 | 1983 | 51.319 | 1982 | 50.692 | 1981 | 49.422 | 1980 | 47.963 | 1979 | 46.659 | 1978 | 45.48 | 1977 | 44.797 | 1976 | 44.647 | 1975 | 44.698 | 1974 | 45.304 | 1973 | 45.905 | 1972 | 46.498 | 1971 | 46.829 | 1970 | 47.153 | 1969 | 47.398 | 1968 | 47.745 | 1967 | 48.094 | 1966 | 48.166 | 1965 | 48.282 | 1964 | 48.238 | 1963 | 44.072 | 1962 | 47.991 | 1961 | 47.664 | 1960 | 47.178 |
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