Year | Value | 2022 | 77.9969130471 | 2021 | 74.769960626394 | 2020 | 76.177503155164 | 2019 | 77.362268225531 | 2018 | 75.580691757715 | 2017 | 74.141522421265 | 2016 | 73.666675465668 | 2015 | 75.56706571315 | 2014 | 75.49609475557 | 2013 | 73.925556970241 | 2012 | 77.509707728631 | 2011 | 73.352834503053 | 2010 | 73.142881682807 | 2009 | 75.73150379418 | 2008 | 73.652542894691 | 2007 | 70.926710995411 | 2006 | 70.196976693796 | 2005 | 68.931595018733 | 2004 | 68.660607023347 | 2003 | 66.211024174037 | 2002 | 66.391711866236 | 2001 | 73.352737282451 | 2000 | 74.643632887381 | 1999 | 72.998812222179 | 1998 | 72.214581597199 | 1997 | 76.076534043686 | 1996 | 75.424827671835 | 1995 | 72.493188310905 | 1994 | 77.025049370467 | 1993 | 74.094530548769 | 1992 | 71.336470628319 | 1991 | 68.346299932625 | 1990 | 69.05236650103 | 1989 | 60.354098275257 | 1988 | 67.989373396288 | 1987 | 77.295976519909 | 1986 | 75.660391511629 | 1985 | 79.271613313845 | 1984 | 82.077578030862 | 1983 | 85.404316047607 | 1982 | 81.988901552155 | 1981 | 77.988934497361 | 1980 | 77.44152560669 | 1979 | 76.933851163957 | 1978 | 76.498874565173 | 1977 | 78.302581066112 | 1976 | 78.752645175154 | 1975 | 80.54652670934 | 1974 | 80.657909615583 | 1973 | 80.283329480137 | 1972 | 85.015325235555 | 1971 | 88.003964841884 | 1970 | 86.476421830995 | 1969 | 88.588018775056 | 1968 | 88.554826444254 | 1967 | 86.872754804517 | 1966 | 87.087322408095 | 1965 | 85.711729764546 | 1964 | 90.223898002021 | 1963 | 90.248490862482 | 1962 | 89.511089596902 |
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