Year | Value | 2021 | 70.123 | 2020 | 71.462 | 2019 | 72.881 | 2018 | 72.814 | 2017 | 72.692 | 2016 | 72.588 | 2015 | 72.487 | 2014 | 72.259 | 2013 | 71.963 | 2012 | 71.734 | 2011 | 71.439 | 2010 | 71.088 | 2009 | 70.911 | 2008 | 70.441 | 2007 | 70.376 | 2006 | 70.261 | 2005 | 70.104 | 2004 | 69.796 | 2003 | 69.507 | 2002 | 69.366 | 2001 | 69.006 | 2000 | 68.662 | 1999 | 68.422 | 1998 | 62.721 | 1997 | 67.777 | 1996 | 67.439 | 1995 | 67.139 | 1994 | 66.574 | 1993 | 66.251 | 1992 | 65.991 | 1991 | 65.752 | 1990 | 65.243 | 1989 | 64.856 | 1988 | 64.345 | 1987 | 64.032 | 1986 | 63.591 | 1985 | 62.996 | 1984 | 62.642 | 1983 | 62.137 | 1982 | 61.527 | 1981 | 61.016 | 1980 | 60.485 | 1979 | 59.908 | 1978 | 59.334 | 1977 | 58.746 | 1976 | 58.158 | 1975 | 57.548 | 1974 | 52.313 | 1973 | 54.415 | 1972 | 55.607 | 1971 | 54.966 | 1970 | 54.44 | 1969 | 53.896 | 1968 | 53.355 | 1967 | 52.632 | 1966 | 52.091 | 1965 | 51.465 | 1964 | 50.812 | 1963 | 50.25 | 1962 | 49.668 | 1961 | 48.73 | 1960 | 48.317 |
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