Year | Value | 2021 | 24.705119341796 | 2020 | 25.007052024704 | 2019 | 25.352102088665 | 2018 | 25.6544994622 | 2017 | 26.007280204632 | 2016 | 26.454590759105 | 2015 | 26.853030238634 | 2014 | 27.189261676675 | 2013 | 27.361211888348 | 2012 | 27.502164924962 | 2011 | 27.597855374763 | 2010 | 27.768216789686 | 2009 | 27.916981784584 | 2008 | 28.067134958557 | 2007 | 28.127746658922 | 2006 | 28.218478471408 | 2005 | 28.144595046857 | 2004 | 28.352296330156 | 2003 | 28.559911509578 | 2002 | 28.700842566287 | 2001 | 28.954012549699 | 2000 | 29.166770604989 | 1999 | 29.447506514595 | 1998 | 29.783373680386 | 1997 | 30.20608799748 | 1996 | 30.726154423517 | 1995 | 31.032784641544 | 1994 | 31.282930732514 | 1993 | 31.6604827016 | 1992 | 32.05953074935 | 1991 | 32.427202477445 | 1990 | 32.815394835054 | 1989 | 33.246842123958 | 1988 | 33.677840326114 | 1987 | 34.128826157732 | 1986 | 34.484147910843 | 1985 | 35.097367664688 | 1984 | 35.529140097464 | 1983 | 35.802120879598 | 1982 | 36.045595282501 | 1981 | 36.244138347893 | 1980 | 36.376363971203 | 1979 | 36.461329804038 | 1978 | 36.399557927338 | 1977 | 36.217674395324 | 1976 | 36.1176828893 | 1975 | 35.916657881547 | 1974 | 35.671410289712 | 1973 | 35.884217233711 | 1972 | 36.397405276592 | 1971 | 37.168731142658 | 1970 | 37.778079081713 | 1969 | 38.43551159777 | 1968 | 38.999616446214 | 1967 | 39.655163270429 | 1966 | 40.586666322303 | 1965 | 41.284898609179 | 1964 | 42.11042026941 | 1963 | 42.972523148777 | 1962 | 43.711246599615 | 1961 | 43.862527887127 | 1960 | 44.673708708156 |
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