Year | Value | 2022 | 52.523260601691 | 2021 | 52.572399659517 | 2020 | 52.623803635204 | 2019 | 52.714728052454 | 2018 | 52.849378435697 | 2017 | 52.992336527901 | 2016 | 53.101390199753 | 2015 | 53.177825090499 | 2014 | 53.242765833464 | 2013 | 53.297085999657 | 2012 | 53.340939091936 | 2011 | 53.375208768228 | 2010 | 53.417146376175 | 2009 | 53.462210539567 | 2008 | 53.502775968186 | 2007 | 53.516851736644 | 2006 | 53.510446577546 | 2005 | 53.507959919153 | 2004 | 53.497445834067 | 2003 | 53.474019815271 | 2002 | 53.444723180882 | 2001 | 53.409990669995 | 2000 | 53.390885525354 | 1999 | 53.413328697298 | 1998 | 53.450490983576 | 1997 | 53.471709262816 | 1996 | 53.470135989461 | 1995 | 53.440140420919 | 1994 | 53.398833253034 | 1993 | 53.357869660125 | 1992 | 53.255980176333 | 1991 | 53.17447897871 | 1990 | 53.204102187978 | 1989 | 53.264028437923 | 1988 | 53.316905896821 | 1987 | 53.374542710308 | 1986 | 53.435658190014 | 1985 | 53.483918410363 | 1984 | 53.527020217344 | 1983 | 53.571594605616 | 1982 | 53.613744788929 | 1981 | 53.655214003801 | 1980 | 53.698383799949 | 1979 | 53.742196947413 | 1978 | 53.782394500878 | 1977 | 53.82656586876 | 1976 | 53.876567121026 | 1975 | 53.933445876672 | 1974 | 53.991347742432 | 1973 | 54.051258385726 | 1972 | 54.11613961429 | 1971 | 54.180844548347 | 1970 | 54.244680062173 | 1969 | 54.345579163404 | 1968 | 54.492192477136 | 1967 | 54.636099052769 | 1966 | 54.786844620342 | 1965 | 54.949442880982 | 1964 | 55.119569353043 | 1963 | 55.294168897619 | 1962 | 55.479025124984 | 1961 | 55.66583390297 | 1960 | 55.846326629799 |
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