Year | Value | 2022 | 49.670610829401 | 2021 | 49.656467812677 | 2020 | 49.64411455363 | 2019 | 49.643065382033 | 2018 | 49.656072751603 | 2017 | 49.669587029878 | 2016 | 49.682672509028 | 2015 | 49.699043766954 | 2014 | 49.718191425209 | 2013 | 49.736629553478 | 2012 | 49.755219817938 | 2011 | 49.77561945239 | 2010 | 49.799045830007 | 2009 | 49.825064085226 | 2008 | 49.851512527647 | 2007 | 49.876300854942 | 2006 | 49.899669257201 | 2005 | 49.920175873332 | 2004 | 49.926472852892 | 2003 | 49.931968523263 | 2002 | 49.950038934446 | 2001 | 49.970682780635 | 2000 | 49.993158676163 | 1999 | 50.015968699574 | 1998 | 50.037660355158 | 1997 | 50.057374647947 | 1996 | 50.074759918787 | 1995 | 50.089484405607 | 1994 | 50.091462142833 | 1993 | 50.081600658618 | 1992 | 50.072773653741 | 1991 | 50.06479688738 | 1990 | 50.058610186866 | 1989 | 50.054563289938 | 1988 | 50.050622686873 | 1987 | 50.047223069996 | 1986 | 50.045486317609 | 1985 | 50.049695373784 | 1984 | 50.060000629776 | 1983 | 50.074205934492 | 1982 | 50.078496575249 | 1981 | 50.073237379171 | 1980 | 50.076418643669 | 1979 | 50.080935801191 | 1978 | 50.079553598344 | 1977 | 50.076049879406 | 1976 | 50.056463779268 | 1975 | 50.023459877376 | 1974 | 49.991158051501 | 1973 | 49.956572237816 | 1972 | 49.922662388774 | 1971 | 49.912402007999 | 1970 | 49.927057457302 | 1969 | 49.943409221037 | 1968 | 49.95985873643 | 1967 | 49.97694148481 | 1966 | 49.994133275957 | 1965 | 50.010177942113 | 1964 | 50.0237882519 | 1963 | 50.034038712042 | 1962 | 50.046994068485 | 1961 | 50.062445615121 | 1960 | 50.083756918357 |
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