Year | Value | 2021 | 69.595045983253 | 2020 | 70.824005801076 | 2019 | 71.677745990748 | 2018 | 71.481166039575 | 2017 | 71.162854803837 | 2016 | 70.973954156231 | 2015 | 70.729614848197 | 2014 | 70.403196701495 | 2013 | 70.014673506615 | 2012 | 69.644453535516 | 2011 | 69.300381164493 | 2010 | 68.959300425845 | 2009 | 68.675785491936 | 2008 | 68.316150671823 | 2007 | 68.091136957561 | 2006 | 67.821145983318 | 2005 | 67.488718819147 | 2004 | 67.09853737792 | 2003 | 66.862163437914 | 2002 | 66.614993405318 | 2001 | 66.275714599764 | 2000 | 65.968267281919 | 1999 | 65.687105004894 | 1998 | 65.443231159626 | 1997 | 65.111073262399 | 1996 | 64.718608352724 | 1995 | 64.351447918283 | 1994 | 64.01708441079 | 1993 | 63.727383581044 | 1992 | 63.541927001914 | 1991 | 63.259516158791 | 1990 | 62.902505751178 | 1989 | 62.71278110882 | 1988 | 62.37001278527 | 1987 | 62.103342542875 | 1986 | 61.757945884677 | 1985 | 61.274629080066 | 1984 | 60.843863317949 | 1983 | 60.420117684138 | 1982 | 59.994299532222 | 1981 | 59.561241031977 | 1980 | 59.177013537425 | 1979 | 58.812441204094 | 1978 | 58.356464068394 | 1977 | 57.928919986773 | 1976 | 57.44323686564 | 1975 | 56.913486435181 | 1974 | 56.339577073802 | 1973 | 55.833341196493 | 1972 | 55.178847801076 | 1971 | 54.729886449838 | 1970 | 54.079130022927 | 1969 | 53.541671223875 | 1968 | 53.128496323512 | 1967 | 52.427798435926 | 1966 | 51.935386467429 | 1965 | 51.166151756974 | 1964 | 51.596668305344 | 1963 | 51.078791122613 | 1962 | 50.603559799851 | 1961 | 47.029331626352 | 1960 | 44.268937939172 |
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