Year | Value | 2022 | 37.668816331296 | 2021 | 37.97349575122 | 2020 | 38.282655570993 | 2019 | 38.582554597396 | 2018 | 38.878054094979 | 2017 | 39.179712927039 | 2016 | 39.483191499586 | 2015 | 39.814796995999 | 2014 | 40.222900716296 | 2013 | 40.604132998272 | 2012 | 40.927922602449 | 2011 | 41.147083415087 | 2010 | 41.366689748177 | 2009 | 41.705974255751 | 2008 | 42.051764283021 | 2007 | 42.384424259606 | 2006 | 42.718829138402 | 2005 | 43.098587650177 | 2004 | 43.483930329408 | 2003 | 43.834697603259 | 2002 | 44.171999314297 | 2001 | 44.515521330732 | 2000 | 44.878528995953 | 1999 | 45.243367367957 | 1998 | 45.606321378006 | 1997 | 45.963208111516 | 1996 | 46.295862384574 | 1995 | 46.623711089097 | 1994 | 46.971420100166 | 1993 | 47.380241298476 | 1992 | 47.800800049448 | 1991 | 48.205398810162 | 1990 | 48.542220162304 | 1989 | 48.876493039893 | 1988 | 49.214891777275 | 1987 | 49.57682339725 | 1986 | 50.028898354278 | 1985 | 50.538651636898 | 1984 | 51.04392792231 | 1983 | 51.578364350699 | 1982 | 52.109189212432 | 1981 | 52.652536664059 | 1980 | 53.206927928701 | 1979 | 53.750200123911 | 1978 | 54.230498475884 | 1977 | 54.722561924167 | 1976 | 55.335967955187 | 1975 | 55.998001925216 | 1974 | 56.622506071012 | 1973 | 57.254340814483 | 1972 | 57.90527491835 | 1971 | 58.554674214767 | 1970 | 59.192955650087 | 1969 | 59.856257158198 | 1968 | 60.518052517347 | 1967 | 61.178296353254 | 1966 | 61.817645439166 | 1965 | 62.539584684947 | 1964 | 63.310399712904 | 1963 | 64.049106747135 | 1962 | 64.779770748276 | 1961 | 65.503685990439 | 1960 | 66.223496053999 |
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