Year | Value | 2021 | 60.062 | 2020 | 59.763 | 2019 | 60.255 | 2018 | 59.796 | 2017 | 58.652 | 2016 | 58.404 | 2015 | 57.189 | 2014 | 56.393 | 2013 | 56.313 | 2012 | 55.451 | 2011 | 54.62 | 2010 | 53.693 | 2009 | 52.626 | 2008 | 51.526 | 2007 | 50.365 | 2006 | 49.323 | 2005 | 48.237 | 2004 | 47.577 | 2003 | 46.963 | 2002 | 46.359 | 2001 | 45.661 | 2000 | 45.05 | 1999 | 42.071 | 1998 | 42.789 | 1997 | 43.715 | 1996 | 43.68 | 1995 | 42.716 | 1994 | 42.925 | 1993 | 43.594 | 1992 | 43.621 | 1991 | 43.506 | 1990 | 44.057 | 1989 | 44.021 | 1988 | 44.047 | 1987 | 44.047 | 1986 | 43.792 | 1985 | 43.888 | 1984 | 43.916 | 1983 | 43.8 | 1982 | 43.571 | 1981 | 43.364 | 1980 | 43.13 | 1979 | 42.873 | 1978 | 42.46 | 1977 | 42.06 | 1976 | 41.631 | 1975 | 41.173 | 1974 | 40.691 | 1973 | 40.217 | 1972 | 39.767 | 1971 | 39.269 | 1970 | 38.793 | 1969 | 38.249 | 1968 | 37.846 | 1967 | 37.434 | 1966 | 36.868 | 1965 | 36.363 | 1964 | 35.87 | 1963 | 35.344 | 1962 | 34.875 | 1961 | 34.412 | 1960 | 33.961 |
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