Year | Value | 2022 | 77.381660168413 | 2021 | 78.576877819483 | 2020 | 79.32252013682 | 2019 | 76.646872209998 | 2018 | 78.396318377506 | 2017 | 76.847275583375 | 2016 | 74.487451698454 | 2015 | 74.616514647387 | 2014 | 74.746044206222 | 2013 | 77.122072607084 | 2012 | 79.885291415561 | 2011 | 77.559431443903 | 2010 | 78.792736371453 | 2009 | 81.103871550976 | 2008 | 81.733262466926 | 2007 | 86.722763385021 | 2006 | 83.827689475419 | 2005 | 85.220834146578 | 2004 | 83.117425936037 | 2003 | 81.809591967328 | 2002 | 81.15614986714 | 2001 | 83.95413453683 | 2000 | 83.491467231602 | 1999 | 83.791867582005 | 1998 | 79.01278596641 | 1997 | 81.153811561633 | 1996 | 83.675423484002 | 1995 | 77.085304730237 | 1994 | 75.066133382105 | 1993 | 86.670546065052 | 1992 | 90.82009396922 | 1991 | 89.616370231181 | 1990 | 88.732944046515 | 1989 | 88.117918923009 | 1988 | 84.751661785901 | 1987 | 83.873025386975 | 1986 | 78.622129262896 | 1985 | 72.6713040528 | 1984 | 74.828571671224 | 1983 | 80.347685358152 | 1982 | 79.715276568614 | 1981 | 81.168721370473 | 1980 | 79.640913071187 | 1979 | 75.093832503068 | 1978 | 71.152118288162 | 1977 | 66.372142122045 | 1976 | 71.517055948968 | 1975 | 77.41162868755 | 1974 | 70.663057610427 | 1973 | 74.297978857297 | 1972 | 74.619183614983 | 1971 | 74.415404477459 | 1970 | 70.842654800279 | 1969 | 70.782707986485 | 1968 | 69.482972193325 | 1967 | 72.785281779316 | 1966 | 70.468998526995 | 1965 | 71.428573234884 | 1964 | 66.694620575297 | 1963 | 70.651474385443 | 1962 | 75.765946705416 | 1961 | 72.771427044583 | 1960 | 70.909594922554 |
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