Year | Value | 2022 | 77.172664920644 | 2021 | 74.801482668122 | 2020 | 75.022424631564 | 2019 | 74.499687046747 | 2018 | 74.338344261297 | 2017 | 74.025490305981 | 2016 | 74.358747795136 | 2015 | 75.388540799502 | 2014 | 77.557761882458 | 2013 | 77.992831146651 | 2012 | 77.636451952516 | 2011 | 77.105467516362 | 2010 | 76.071161666574 | 2009 | 76.947858561793 | 2008 | 73.788828772026 | 2007 | 72.469601694254 | 2006 | 72.624092298114 | 2005 | 72.545837154818 | 2004 | 72.453616909227 | 2003 | 72.733595104745 | 2002 | 72.83737166066 | 2001 | 71.651049677243 | 2000 | 70.217962536539 | 1999 | 70.31413833661 | 1998 | 68.664731646416 | 1997 | 67.905753594824 | 1996 | 67.595447848158 | 1995 | 67.823551345968 | 1994 | 67.47814367173 | 1993 | 66.12716646138 | 1992 | 64.444269015545 | 1991 | 63.315411759702 | 1990 | 63.783942209661 | 1989 | 63.811646826845 | 1988 | 64.02868035277 | 1987 | 65.224272851238 | 1986 | 65.23850881713 | 1985 | 65.646206043385 | 1984 | 66.281178088465 | 1983 | 67.038182956036 | 1982 | 66.609231046419 | 1981 | 65.388930502567 | 1980 | 65.764603385168 | 1979 | 65.491803269153 | 1978 | 64.525568093021 | 1977 | 64.740864365186 | 1976 | 64.60717514768 | 1975 | 64.531297112642 | 1974 | 60.77519112526 | 1973 | 59.054723198548 | 1972 | 59.230057444585 | 1971 | 58.571644883946 | 1970 | 56.71809095875 |
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