Year | Value | 2021 | 52.663892774486 | 2020 | 52.663892774486 | 2019 | 52.663892774486 | 2018 | 52.663892774486 | 2017 | 52.431903151148 | 2016 | 52.149991098451 | 2015 | 51.753605127292 | 2014 | 51.49110099443 | 2013 | 51.228596861568 | 2012 | 50.966092728706 | 2011 | 50.703588595844 | 2010 | 50.441084462982 | 2009 | 50.159304661868 | 2008 | 49.877524860754 | 2007 | 49.59574505964 | 2006 | 49.313965258526 | 2005 | 49.032185457412 | 2004 | 48.750405656298 | 2003 | 48.468625855184 | 2002 | 48.186846054071 | 2001 | 47.905066252957 | 2000 | 47.623286451843 | 1999 | 47.344795137211 | 1998 | 47.066303822579 | 1997 | 46.787812507948 | 1996 | 46.509321193316 | 1995 | 46.230829878685 | 1994 | 45.952338564053 | 1993 | 45.673847249421 | 1992 | 45.39535593479 | 1991 | 45.116864620158 | 1990 | 44.838373305527 | 1989 | 44.774790813602 | 1988 | 44.711208321677 | 1987 | 44.647625829751 | 1986 | 44.520460845902 | 1985 | 44.456878353976 | 1984 | 44.393295862051 | 1983 | 44.266130878201 | 1982 | 44.266130878201 | 1981 | 44.164398891121 | 1980 | 44.100816399196 | 1979 | 44.100816399196 | 1978 | 44.100816399196 | 1977 | 44.100816399196 | 1976 | 44.100816399196 | 1975 | 44.100816399196 | 1974 | 44.075383402426 | 1973 | 44.075383402426 | 1972 | 44.009257610824 | 1971 | 43.985096263893 | 1970 | 43.985096263893 | 1969 | 43.87700602762 | 1968 | 43.744754444416 | 1967 | 43.617589460566 | 1966 | 43.584526564765 | 1965 | 43.576896665734 | 1964 | 43.564180167349 | 1963 | 43.554006968641 | 1962 | 43.541290470256 | 1961 | 43.527302322033 |
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