Year | Value | 2021 | 59.821 | 2020 | 60.088 | 2019 | 60.454 | 2018 | 60.14 | 2017 | 59.856 | 2016 | 59.539 | 2015 | 59.377 | 2014 | 59.125 | 2013 | 58.965 | 2012 | 58.716 | 2011 | 58.462 | 2010 | 58.363 | 2009 | 57.956 | 2008 | 57.869 | 2007 | 57.675 | 2006 | 57.456 | 2005 | 57.125 | 2004 | 56.826 | 2003 | 56.738 | 2002 | 56.606 | 2001 | 56.66 | 2000 | 56.578 | 1999 | 56.526 | 1998 | 56.218 | 1997 | 55.978 | 1996 | 55.558 | 1995 | 55.295 | 1994 | 54.91 | 1993 | 54.537 | 1992 | 54.089 | 1991 | 53.624 | 1990 | 53.292 | 1989 | 52.684 | 1988 | 52.294 | 1987 | 51.659 | 1986 | 51.075 | 1985 | 50.374 | 1984 | 49.747 | 1983 | 49.333 | 1982 | 48.813 | 1981 | 48.31 | 1980 | 47.877 | 1979 | 47.362 | 1978 | 46.961 | 1977 | 46.176 | 1976 | 45.488 | 1975 | 44.681 | 1974 | 44.085 | 1973 | 43.596 | 1972 | 43.158 | 1971 | 42.581 | 1970 | 42.189 | 1969 | 41.849 | 1968 | 41.522 | 1967 | 41.055 | 1966 | 40.648 | 1965 | 40.184 | 1964 | 39.758 | 1963 | 39.334 | 1962 | 38.928 | 1961 | 38.542 | 1960 | 38.181 |
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