Year | Value | 2021 | 37.556334501753 | 2020 | 37.556334501753 | 2019 | 37.556334501753 | 2018 | 37.556334501753 | 2017 | 37.556334501753 | 2016 | 37.556334501753 | 2015 | 37.556334501753 | 2014 | 37.556334501753 | 2013 | 37.556334501753 | 2012 | 38.057085628443 | 2011 | 39.058587881823 | 2010 | 39.408866995074 | 2009 | 39.408866995074 | 2008 | 39.408866995074 | 2007 | 39.901477832512 | 2006 | 40.886699507389 | 2005 | 41.871921182266 | 2004 | 42.857142857143 | 2003 | 43.349753694581 | 2002 | 43.84236453202 | 2001 | 44.827586206897 | 2000 | 44.334975369458 | 1999 | 43.84236453202 | 1998 | 44.827586206897 | 1997 | 44.334975369458 | 1996 | 44.827586206897 | 1995 | 45.320197044335 | 1994 | 45.812807881773 | 1993 | 46.305418719212 | 1992 | 47.290640394089 | 1991 | 47.783251231527 | 1990 | 48.275862068966 | 1989 | 48.768472906404 | 1988 | 49.261083743842 | 1987 | 49.261083743842 | 1986 | 49.261083743842 | 1985 | 49.261083743842 | 1984 | 49.261083743842 | 1983 | 49.261083743842 | 1982 | 49.261083743842 | 1981 | 49.261083743842 | 1980 | 49.261083743842 | 1979 | 49.261083743842 | 1978 | 49.261083743842 | 1977 | 49.261083743842 | 1976 | 49.261083743842 | 1975 | 48.768472906404 | 1974 | 49.261083743842 | 1973 | 49.261083743842 | 1972 | 49.261083743842 | 1971 | 49.261083743842 | 1970 | 49.261083743842 | 1969 | 49.261083743842 | 1968 | 49.261083743842 | 1967 | 46.305418719212 | 1966 | 43.84236453202 | 1965 | 45.320197044335 | 1964 | 44.827586206897 | 1963 | 44.827586206897 | 1962 | 44.827586206897 | 1961 | 44.334975369458 |
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