Year | Value | 2022 | 50.235218981007 | 2021 | 50.250983875314 | 2020 | 50.265459579882 | 2019 | 50.276142972056 | 2018 | 50.28638406324 | 2017 | 50.295637763932 | 2016 | 50.305741410074 | 2015 | 50.316685370169 | 2014 | 50.323790948771 | 2013 | 50.329448512853 | 2012 | 50.333340109313 | 2011 | 50.333961464106 | 2010 | 50.333485955519 | 2009 | 50.333692061439 | 2008 | 50.331494898977 | 2007 | 50.32420837628 | 2006 | 50.310698629269 | 2005 | 50.291771234107 | 2004 | 50.268369517303 | 2003 | 50.240907201506 | 2002 | 50.210667971049 | 2001 | 50.174720176777 | 2000 | 50.133410427014 | 1999 | 50.102509191376 | 1998 | 50.077176443741 | 1997 | 50.042968323865 | 1996 | 50.008862187616 | 1995 | 49.982264066853 | 1994 | 49.955718434797 | 1993 | 49.923079171066 | 1992 | 49.890162866505 | 1991 | 49.837434565615 | 1990 | 49.788171299208 | 1989 | 49.762481363628 | 1988 | 49.726193458563 | 1987 | 49.681007567519 | 1986 | 49.642531913102 | 1985 | 49.613186627154 | 1984 | 49.596376695698 | 1983 | 49.591796164094 | 1982 | 49.586346507022 | 1981 | 49.577934452603 | 1980 | 49.569716749259 | 1979 | 49.564371037535 | 1978 | 49.566848949322 | 1977 | 49.574554315418 | 1976 | 49.582429683479 | 1975 | 49.589302107666 | 1974 | 49.591129974509 | 1973 | 49.588962985851 | 1972 | 49.584990001113 | 1971 | 49.579750150466 | 1970 | 49.572778193322 | 1969 | 49.566064960654 | 1968 | 49.561305417416 | 1967 | 49.556399538823 | 1966 | 49.552308734715 | 1965 | 49.54872116905 | 1964 | 49.546571494464 | 1963 | 49.545607081656 | 1962 | 49.544432521428 | 1961 | 49.544776144522 | 1960 | 49.546392293181 |
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