Year | Value | 2022 | 49.422967946929 | 2021 | 49.407888245665 | 2020 | 49.389339691463 | 2019 | 49.377259997436 | 2018 | 49.370138217056 | 2017 | 49.341337215014 | 2016 | 49.287378385003 | 2015 | 49.218027360273 | 2014 | 49.169991698441 | 2013 | 49.153939740051 | 2012 | 49.142880078379 | 2011 | 49.145565677513 | 2010 | 49.159399091037 | 2009 | 49.21270297218 | 2008 | 49.277462997964 | 2007 | 49.309250486684 | 2006 | 49.332149172335 | 2005 | 49.355911033873 | 2004 | 49.381037384467 | 2003 | 49.409167288577 | 2002 | 49.43120380796 | 2001 | 49.446453651472 | 2000 | 49.445668985551 | 1999 | 49.428187153035 | 1998 | 49.427949637745 | 1997 | 49.429022590747 | 1996 | 49.497723769058 | 1995 | 49.591720516618 | 1994 | 49.547090894305 | 1993 | 49.426641601289 | 1992 | 49.385656061301 | 1991 | 49.419915416758 | 1990 | 49.452102822818 | 1989 | 49.483557862434 | 1988 | 49.555881310797 | 1987 | 49.550924783859 | 1986 | 49.473616966362 | 1985 | 49.402677270889 | 1984 | 49.37785192378 | 1983 | 49.376735799737 | 1982 | 49.378563489168 | 1981 | 49.464957143784 | 1980 | 49.55713540176 | 1979 | 49.611902172971 | 1978 | 49.61662344673 | 1977 | 49.605242208842 | 1976 | 49.586027464115 | 1975 | 49.563766565833 | 1974 | 49.540938361526 | 1973 | 49.51790272942 | 1972 | 49.489400952979 | 1971 | 49.460042414899 | 1970 | 49.43577679034 | 1969 | 49.411062546449 | 1968 | 49.383675700836 | 1967 | 49.361054814379 | 1966 | 49.342693649071 | 1965 | 49.320787580833 | 1964 | 49.294152932144 | 1963 | 49.265425936717 | 1962 | 49.237004376482 | 1961 | 49.205519771876 | 1960 | 49.173857635252 |
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