Year | Value | 2022 | 49.454844682164 | 2021 | 49.507099876984 | 2020 | 49.557847988976 | 2019 | 49.602705744668 | 2018 | 49.646406727829 | 2017 | 49.689269204066 | 2016 | 49.730462040779 | 2015 | 49.766260683396 | 2014 | 49.79920367955 | 2013 | 49.830438331283 | 2012 | 49.853284351101 | 2011 | 49.86552034622 | 2010 | 49.861058297013 | 2009 | 49.827919475744 | 2008 | 49.772209567198 | 2007 | 49.716448381667 | 2006 | 49.669009431129 | 2005 | 49.628142648108 | 2004 | 49.581402711902 | 2003 | 49.532343434715 | 2002 | 49.481764411399 | 2001 | 49.438335180642 | 2000 | 49.423824451411 | 1999 | 49.418031543828 | 1998 | 49.402314239266 | 1997 | 49.381167419301 | 1996 | 49.361884535199 | 1995 | 49.343608055242 | 1994 | 49.324858363055 | 1993 | 49.306504256536 | 1992 | 49.29108045349 | 1991 | 49.268722100535 | 1990 | 49.235774871575 | 1989 | 49.200823027688 | 1988 | 49.166306072407 | 1987 | 49.132914168738 | 1986 | 49.097989763371 | 1985 | 49.061777312412 | 1984 | 49.025837320574 | 1983 | 48.980847088135 | 1982 | 48.92704882958 | 1981 | 48.869735047495 | 1980 | 48.798434635338 | 1979 | 48.713827712346 | 1978 | 48.630714583848 | 1977 | 48.550504831651 | 1976 | 48.469860078821 | 1975 | 48.381570804596 | 1974 | 48.285948605795 | 1973 | 48.189873651886 | 1972 | 48.096414514781 | 1971 | 47.999160153081 | 1970 | 47.896983218547 | 1969 | 47.844102160327 | 1968 | 47.852589641434 | 1967 | 47.865641717965 | 1966 | 47.883333673033 | 1965 | 47.89948878628 | 1964 | 47.915537582857 | 1963 | 47.934912053284 | 1962 | 47.95412638692 | 1961 | 47.974903245976 | 1960 | 47.986115659179 |
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