Year | Value | 2021 | 38.502027940514 | 2020 | 39.704621901757 | 2019 | 39.97656602073 | 2018 | 39.700766110861 | 2017 | 39.195132942767 | 2016 | 40.350428120775 | 2015 | 40.364488508337 | 2014 | 40.378548895899 | 2013 | 40.392609283461 | 2012 | 38.411536728256 | 2011 | 37.603424966201 | 2010 | 38.308246958089 | 2009 | 38.341595313204 | 2008 | 38.408292023434 | 2007 | 38.247859396124 | 2006 | 38.011716989635 | 2005 | 38.356917530419 | 2004 | 38.20730058585 | 2003 | 37.90085624155 | 2002 | 37.500675980171 | 2001 | 37.625056331681 | 2000 | 40.431726002704 | 1999 | 41.160883280757 | 1998 | 41.048219918882 | 1997 | 40.632717440288 | 1996 | 40.486705723299 | 1995 | 40.119873817035 | 1994 | 40.437133844074 | 1993 | 40.471383506084 | 1992 | 40.543488057684 | 1991 | 40.454258675079 | 1990 | 40.633618747183 | 1989 | 40.723749436683 | 1988 | 40.813880126183 | 1987 | 40.920234339793 | 1986 | 40.914826498423 | 1985 | 40.896800360523 | 1984 | 40.879675529518 | 1983 | 40.864353312303 | 1982 | 40.849932401983 | 1981 | 40.836412798558 | 1980 | 40.821991888238 | 1979 | 40.808472284813 | 1978 | 40.794051374493 | 1977 | 40.842721946823 | 1976 | 40.675980171248 | 1975 | 40.662460567823 | 1974 | 40.648039657503 | 1973 | 40.634520054078 | 1972 | 40.620099143758 | 1971 | 40.607480847229 | 1970 | 38.783235691753 | 1969 | 38.783235691753 | 1968 | 38.778729157278 | 1967 | 38.776926543488 | 1966 | 38.774222622803 | 1965 | 38.763406940063 | 1964 | 37.85038305543 | 1963 | 37.397926994141 | 1962 | 36.928346101848 | 1961 | 36.02523659306 |
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