Year | Value | 2022 | 53.956096694331 | 2021 | 53.90554372251 | 2020 | 53.859933940505 | 2019 | 53.817393085011 | 2018 | 53.789945804137 | 2017 | 53.776346133799 | 2016 | 53.769240356774 | 2015 | 53.768273723846 | 2014 | 53.76526023653 | 2013 | 53.759429879074 | 2012 | 53.748338233226 | 2011 | 53.716145112471 | 2010 | 53.673269089929 | 2009 | 53.640373333574 | 2008 | 53.61554240952 | 2007 | 53.596453322852 | 2006 | 53.575845342137 | 2005 | 53.545945849102 | 2004 | 53.51558124874 | 2003 | 53.487375865275 | 2002 | 53.458259318736 | 2001 | 53.435734921224 | 2000 | 53.416643892453 | 1999 | 53.391112758546 | 1998 | 53.359277259515 | 1997 | 53.322166376756 | 1996 | 53.282277063514 | 1995 | 53.241004135467 | 1994 | 53.202404300745 | 1993 | 53.185702110704 | 1992 | 53.196243532899 | 1991 | 53.214695087801 | 1990 | 53.239600039315 | 1989 | 53.281669219387 | 1988 | 53.327494706527 | 1987 | 53.372024969503 | 1986 | 53.424576564425 | 1985 | 53.464237545236 | 1984 | 53.479534774294 | 1983 | 53.489801979179 | 1982 | 53.498107593261 | 1981 | 53.503718340597 | 1980 | 53.512961920015 | 1979 | 53.517223014421 | 1978 | 53.522963658669 | 1977 | 53.537708195402 | 1976 | 53.55916020458 | 1975 | 53.588426499078 | 1974 | 53.62666168694 | 1973 | 53.679409544127 | 1972 | 53.743091636447 | 1971 | 53.819551128609 | 1970 | 53.907702131529 | 1969 | 54.003913508455 | 1968 | 54.11645326859 | 1967 | 54.240971170869 | 1966 | 54.372023301138 | 1965 | 54.510438049323 | 1964 | 54.654178982895 | 1963 | 54.809702971345 | 1962 | 54.971633837252 | 1961 | 55.132533387886 | 1960 | 55.289281447311 |
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