Year | Value | 2022 | 77.10318124352 | 2021 | 76.66061613438 | 2020 | 75.613726560291 | 2019 | 74.074080857414 | 2018 | 74.404998091891 | 2017 | 74.475826279666 | 2016 | 74.532722867655 | 2015 | 75.857336069644 | 2014 | 73.290022619611 | 2013 | 73.862521676862 | 2012 | 73.625657927779 | 2011 | 74.10544041056 | 2010 | 76.476013705743 | 2009 | 75.967368102265 | 2008 | 73.342160676921 | 2007 | 76.01877454883 | 2006 | 76.583819715224 | 2005 | 79.226380267369 | 2004 | 81.357536625626 | 2003 | 82.455277299336 | 2002 | 82.689423374489 | 2001 | 81.950369792389 | 2000 | 73.93090771506 | 1999 | 76.81770471265 | 1998 | 83.615548479032 | 1997 | 81.638389437079 | 1996 | 81.131317874591 | 1995 | 83.512699161219 | 1994 | 81.931839615066 | 1993 | 82.022106741905 | 1992 | 73.869006968187 | 1991 | 75.802019559317 | 1990 | 74.99416523388 | 1989 | 77.456967179169 | 1988 | 78.540492103486 | 1987 | 81.590956489848 | 1986 | 78.282950397937 | 1985 | 77.402960899193 | 1984 | 79.523624843887 | 1983 | 79.090752293143 | 1982 | 81.335145555037 | 1981 | 74.853226871248 | 1980 | 75.354075710978 | 1979 | 77.478180095651 | 1978 | 77.228610362844 | 1977 | 77.346772692756 | 1976 | 80.886873338802 | 1975 | 82.68841847362 | 1974 | 71.457070970465 | 1973 | 78.256146060685 | 1972 | 79.888646740735 | 1971 | 83.710850375967 | 1970 | 84.008881799232 | 1969 | 81.115384924494 | 1968 | 84.518333027889 | 1967 | 79.020299548812 | 1966 | 78.246233235659 | 1965 | 76.94592909019 | 1964 | 76.688445182777 | 1963 | 75.796234341545 | 1962 | 75.763997648369 | 1961 | 75.531548573648 | 1960 | 74.98913086306 |
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