Year | Value | 2021 | 80.387528521687 | 2020 | 80.452093051787 | 2019 | 81.31485796394 | 2018 | 81.02872899908 | 2017 | 80.932598617398 | 2016 | 80.95129748073 | 2015 | 80.56843942421 | 2014 | 80.871982396586 | 2013 | 80.46479376896 | 2012 | 80.157659486126 | 2011 | 80.138742149249 | 2010 | 79.630033712467 | 2009 | 79.357636023217 | 2008 | 79.125296409877 | 2007 | 78.901819089245 | 2006 | 78.668010036854 | 2005 | 78.271428667812 | 2004 | 78.114499895716 | 2003 | 77.589335996932 | 2002 | 77.531003298642 | 2001 | 77.422950174897 | 2000 | 77.075316884065 | 1999 | 76.745200188874 | 1998 | 76.511241625011 | 1997 | 76.241875468672 | 1996 | 75.924021829976 | 1995 | 75.671243755564 | 1994 | 75.525736522287 | 1993 | 75.255401339641 | 1992 | 75.126892881813 | 1991 | 74.809960760618 | 1990 | 74.69732687513 | 1989 | 74.654649482347 | 1988 | 74.526776944123 | 1987 | 74.324533725352 | 1986 | 74.071564703311 | 1985 | 73.815473309553 | 1984 | 73.740481720648 | 1983 | 73.448899213515 | 1982 | 73.403345583105 | 1981 | 73.125229633857 | 1980 | 72.789606216994 | 1979 | 72.766984944233 | 1978 | 72.485110176757 | 1977 | 72.394177601669 | 1976 | 72.069148285796 | 1975 | 71.798966742725 | 1974 | 71.779902960556 | 1973 | 71.468803766015 | 1972 | 71.350539978941 | 1971 | 70.965798005744 | 1970 | 70.822356930555 | 1969 | 70.421802432198 | 1968 | 70.595932390551 | 1967 | 70.589844197585 | 1966 | 70.582351860876 | 1965 | 70.270865130013 | 1964 | 70.160918857185 | 1963 | 69.641270470452 | 1962 | 69.281273112039 | 1961 | 69.437354299677 | 1960 | 69.037606361212 |
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