Year | Value | 2021 | 73.840411867835 | 2020 | 75.467188432651 | 2019 | 75.343235359259 | 2018 | 75.469467514879 | 2017 | 75.403369027013 | 2016 | 75.299246436833 | 2015 | 75.222101858419 | 2014 | 75.101888243887 | 2013 | 75.08112186131 | 2012 | 75.073925432278 | 2011 | 75.035564797073 | 2010 | 74.822722526321 | 2009 | 74.659728629542 | 2008 | 73.916890488884 | 2007 | 73.814713210286 | 2006 | 73.605858332921 | 2005 | 73.525298072792 | 2004 | 73.25027560771 | 2003 | 72.649826864917 | 2002 | 72.811624574687 | 2001 | 72.322575100266 | 2000 | 72.107883276961 | 1999 | 71.782349579454 | 1998 | 71.939539705086 | 1997 | 71.68540734612 | 1996 | 71.995469788733 | 1995 | 71.799086008655 | 1994 | 71.786863106056 | 1993 | 71.727165074007 | 1992 | 71.632845019868 | 1991 | 71.681330784171 | 1990 | 71.396149656416 | 1989 | 71.418372130433 | 1988 | 70.974999442432 | 1987 | 70.869459302478 | 1986 | 70.591301354651 | 1985 | 70.281146519585 | 1984 | 70.163355087332 | 1983 | 69.994832848668 | 1982 | 69.98849041202 | 1981 | 69.652041287982 | 1980 | 69.419707957735 | 1979 | 69.240071086267 | 1978 | 68.93003827338 | 1977 | 68.705136386481 | 1976 | 68.670935976694 | 1975 | 68.506196117655 | 1974 | 68.21604303404 | 1973 | 67.820983792559 | 1972 | 67.370028752224 | 1971 | 67.257399778538 | 1970 | 67.120399323366 | 1969 | 66.747074451808 | 1968 | 66.566224346342 | 1967 | 66.585260099861 | 1966 | 66.251703668864 | 1965 | 65.874416939091 | 1964 | 65.491387285224 | 1963 | 65.143906232045 | 1962 | 64.502383631579 | 1961 | 63.947553040484 | 1960 | 63.78181062659 |
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