Year | Value | 2022 | 52.996286439562 | 2021 | 52.982905709982 | 2020 | 52.960823301235 | 2019 | 52.934554396919 | 2018 | 52.915218068433 | 2017 | 52.902277366844 | 2016 | 52.883978457271 | 2015 | 52.856887534035 | 2014 | 52.82440017646 | 2013 | 52.833857586179 | 2012 | 52.891816643868 | 2011 | 52.956828730537 | 2010 | 53.027250874485 | 2009 | 53.100280141108 | 2008 | 53.175376021536 | 2007 | 53.253883941256 | 2006 | 53.326052965187 | 2005 | 53.39110901746 | 2004 | 53.463947092653 | 2003 | 53.541182107235 | 2002 | 53.564994750227 | 2001 | 53.525447456509 | 2000 | 53.475545652086 | 1999 | 53.431254197007 | 1998 | 53.396652137203 | 1997 | 53.362390604203 | 1996 | 53.321612375853 | 1995 | 53.283448921167 | 1994 | 53.253688089408 | 1993 | 53.219193483934 | 1992 | 53.187565275547 | 1991 | 53.17317114187 | 1990 | 53.169019570312 | 1989 | 53.167387784477 | 1988 | 53.17438692848 | 1987 | 53.193596833317 | 1986 | 53.21003214774 | 1985 | 53.223296253681 | 1984 | 53.24083779216 | 1983 | 53.263729017744 | 1982 | 53.301729003602 | 1981 | 53.349905140843 | 1980 | 53.400443814551 | 1979 | 53.427306590981 | 1978 | 53.434582398325 | 1977 | 53.449887537737 | 1976 | 53.462855033023 | 1975 | 53.470058265866 | 1974 | 53.470873717573 | 1973 | 53.469577455195 | 1972 | 53.463976976014 | 1971 | 53.452594642544 | 1970 | 53.447423207857 | 1969 | 53.330743952579 | 1968 | 53.089169246583 | 1967 | 52.839956284153 | 1966 | 52.582714829295 | 1965 | 52.465989165779 | 1964 | 52.498405185246 | 1963 | 52.529232098737 | 1962 | 52.55804897277 | 1961 | 52.588807880245 | 1960 | 52.620096497784 |
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