Year | Value | 2021 | 69.513063224694 | 2020 | 69.73565235417 | 2019 | 70.727034669804 | 2018 | 70.491533408482 | 2017 | 70.175814603076 | 2016 | 69.712812350365 | 2015 | 69.604127197848 | 2014 | 69.290051662203 | 2013 | 68.937630131029 | 2012 | 68.951232068789 | 2011 | 69.19215100043 | 2010 | 68.98794239878 | 2009 | 68.789026792651 | 2008 | 68.395493411182 | 2007 | 67.976717720727 | 2006 | 67.642223819761 | 2005 | 67.594148858989 | 2004 | 67.37419507432 | 2003 | 66.956480634429 | 2002 | 67.207129768835 | 2001 | 66.865842257524 | 2000 | 66.519576472709 | 1999 | 66.233459591055 | 1998 | 65.835277415444 | 1997 | 65.567883494883 | 1996 | 65.306915590125 | 1995 | 64.944314797814 | 1994 | 64.633128625471 | 1993 | 64.59486131882 | 1992 | 64.259446225388 | 1991 | 63.624964207158 | 1990 | 62.322406494046 | 1989 | 62.363233962267 | 1988 | 60.964824415181 | 1987 | 60.62738114589 | 1986 | 59.722855297734 | 1985 | 59.278235988106 | 1984 | 58.500598583639 | 1983 | 56.871934107021 | 1982 | 55.256219904525 | 1981 | 54.927617537583 | 1980 | 55.670938836405 | 1979 | 55.719476541144 | 1978 | 54.598369750744 | 1977 | 54.090296561445 | 1976 | 52.782737959676 | 1975 | 52.291679287879 | 1974 | 51.812356225582 | 1973 | 50.991782301141 | 1972 | 50.640094204565 | 1971 | 50.07544210543 | 1970 | 49.400045678032 | 1969 | 48.850860015044 | 1968 | 48.295711476464 | 1967 | 47.85159711402 | 1966 | 47.434464413251 | 1965 | 46.989986493056 | 1964 | 46.39421213579 | 1963 | 45.696742897805 | 1962 | 44.349759174165 | 1961 | 44.116032663804 | 1960 | 43.422953747216 |
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