Year | Value | 2022 | 62.235431878039 | 2021 | 61.473124569784 | 2020 | 60.698662924258 | 2019 | 59.890917810442 | 2018 | 59.054703666381 | 2017 | 58.197239072946 | 2016 | 57.32220600456 | 2015 | 56.438638125563 | 2014 | 55.552314337345 | 2013 | 54.663746662036 | 2012 | 53.775994456616 | 2011 | 52.882468474796 | 2010 | 51.954085638123 | 2009 | 50.928581914682 | 2008 | 49.898381618332 | 2007 | 48.858620052415 | 2006 | 47.821406657209 | 2005 | 46.769354377193 | 2004 | 45.686433886902 | 2003 | 44.599636719179 | 2002 | 43.515802577913 | 2001 | 42.432516370595 | 2000 | 41.440542032071 | 1999 | 40.633127655633 | 1998 | 39.8538417529 | 1997 | 39.083295033071 | 1996 | 38.326560177782 | 1995 | 37.567851927102 | 1994 | 36.822555881141 | 1993 | 36.090750042888 | 1992 | 35.375777080594 | 1991 | 34.673839101591 | 1990 | 33.980305527052 | 1989 | 33.332107209727 | 1988 | 32.694166998487 | 1987 | 32.068814378945 | 1986 | 31.44982445098 | 1985 | 30.844726343418 | 1984 | 30.25183983076 | 1983 | 29.662156612388 | 1982 | 29.088301753289 | 1981 | 28.424227420332 | 1980 | 27.759343140929 | 1979 | 27.123874195956 | 1978 | 26.51531759876 | 1977 | 26.124955144535 | 1976 | 25.937316388563 | 1975 | 25.744409634954 | 1974 | 25.61079927421 | 1973 | 25.352087869764 | 1972 | 25.171015160942 | 1971 | 25.069605883829 | 1970 | 24.953065036303 | 1969 | 24.874109266123 | 1968 | 24.79847710199 | 1967 | 24.72855410916 | 1966 | 24.678699790745 | 1965 | 24.679241688606 | 1964 | 24.678616763585 | 1963 | 24.203537794774 | 1962 | 23.739121011089 | 1961 | 23.212318816589 | 1960 | 22.627607243546 |
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