Year | Value | 2021 | 62.948 | 2020 | 63.395 | 2019 | 62.963 | 2018 | 62.869 | 2017 | 62.774 | 2016 | 62.439 | 2015 | 62.286 | 2014 | 62.085 | 2013 | 61.792 | 2012 | 61.633 | 2011 | 61.51 | 2010 | 61.297 | 2009 | 60.983 | 2008 | 60.832 | 2007 | 60.592 | 2006 | 60.373 | 2005 | 60.112 | 2004 | 59.974 | 2003 | 60.102 | 2002 | 60.003 | 2001 | 60.114 | 2000 | 60.076 | 1999 | 59.965 | 1998 | 58.975 | 1997 | 59.596 | 1996 | 59.266 | 1995 | 59.212 | 1994 | 58.897 | 1993 | 58.658 | 1992 | 58.314 | 1991 | 58.024 | 1990 | 57.801 | 1989 | 57.668 | 1988 | 57.413 | 1987 | 57.257 | 1986 | 57.005 | 1985 | 56.954 | 1984 | 56.706 | 1983 | 56.499 | 1982 | 56.265 | 1981 | 55.966 | 1980 | 55.678 | 1979 | 55.218 | 1978 | 54.803 | 1977 | 54.324 | 1976 | 53.898 | 1975 | 53.346 | 1974 | 52.813 | 1973 | 52.189 | 1972 | 51.474 | 1971 | 50.804 | 1970 | 50.435 | 1969 | 49.726 | 1968 | 49.105 | 1967 | 48.388 | 1966 | 47.833 | 1965 | 47.141 | 1964 | 46.543 | 1963 | 46.01 | 1962 | 45.071 | 1961 | 44.641 | 1960 | 44.129 |
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