Year | Value | 2022 | 59.18082319985 | 2021 | 58.321417787039 | 2020 | 57.434717886172 | 2019 | 56.519210394167 | 2018 | 55.574852927047 | 2017 | 54.602349158515 | 2016 | 53.60477534994 | 2015 | 52.598608763104 | 2014 | 51.587352349442 | 2013 | 50.570628849865 | 2012 | 49.551044010153 | 2011 | 48.525239857154 | 2010 | 47.474016716936 | 2009 | 46.357983725156 | 2008 | 45.241661148859 | 2007 | 44.124470163991 | 2006 | 43.012377442718 | 2005 | 41.88770220005 | 2004 | 40.738206237724 | 2003 | 39.592824462561 | 2002 | 38.457911114726 | 2001 | 37.334599581253 | 2000 | 36.291660662669 | 1999 | 35.36392892339 | 1998 | 34.461306108804 | 1997 | 33.569686200493 | 1996 | 32.690827600473 | 1995 | 31.82198988534 | 1994 | 30.969421562597 | 1993 | 30.131596949688 | 1992 | 29.309765324022 | 1991 | 28.500590361989 | 1990 | 27.715805432881 | 1989 | 26.996194094246 | 1988 | 26.290742570279 | 1987 | 25.598539383653 | 1986 | 24.91981558064 | 1985 | 24.252762646268 | 1984 | 23.596520770564 | 1983 | 22.950739858752 | 1982 | 22.322802410628 | 1981 | 21.59530626845 | 1980 | 20.878984861822 | 1979 | 20.189987388817 | 1978 | 19.534334335684 | 1977 | 19.126060242222 | 1976 | 18.955788353219 | 1975 | 18.789168242507 | 1974 | 18.732325185934 | 1973 | 18.522326104296 | 1972 | 18.390707607931 | 1971 | 18.346766438849 | 1970 | 18.322764715287 | 1969 | 18.32945436454 | 1968 | 18.342231604831 | 1967 | 18.35604095789 | 1966 | 18.371406847062 | 1965 | 18.424855124698 | 1964 | 18.509494508171 | 1963 | 18.035507521904 | 1962 | 17.569352279186 | 1961 | 17.108243339171 | 1960 | 16.649674629745 |
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