Year | Value | 2022 | 77.85872211251 | 2021 | 79.55645103228 | 2020 | 80.132099688729 | 2019 | 74.762608044793 | 2018 | 74.433969897685 | 2017 | 73.773028053018 | 2016 | 72.281060837789 | 2015 | 73.111136332927 | 2014 | 76.403738400978 | 2013 | 76.824378663665 | 2012 | 78.217510109897 | 2011 | 76.73446669245 | 2010 | 76.244798827659 | 2009 | 76.632046119628 | 2008 | 76.065867441131 | 2007 | 79.415844080795 | 2006 | 80.652817278588 | 2005 | 82.863059128035 | 2004 | 80.767108384558 | 2003 | 81.662964261167 | 2002 | 78.5912198752 | 2001 | 77.952462697606 | 2000 | 81.947381108284 | 1999 | 80.946000253614 | 1998 | 78.483244044491 | 1997 | 77.762735094547 | 1996 | 78.748776125837 | 1995 | 78.358659942238 | 1994 | 77.179815969306 | 1993 | 78.23992316616 | 1992 | 80.244984982348 | 1991 | 79.488434106204 | 1990 | 78.031417198891 | 1989 | 77.272162696897 | 1988 | 78.363390274093 | 1987 | 78.633605485341 | 1986 | 76.067126697672 | 1985 | 77.380196292381 | 1984 | 75.238751012202 | 1983 | 75.186193266634 | 1982 | 75.048068318024 | 1981 | 73.092582741875 | 1980 | 71.391427701571 | 1979 | 72.15182425338 | 1978 | 70.62775007592 | 1977 | 69.299522638797 | 1976 | 69.331442041201 | 1975 | 71.567083663411 | 1974 | 72.06987697706 | 1973 | 68.17472803862 | 1972 | 71.707258490008 | 1971 | 71.422346779786 | 1970 | 71.329449838188 |
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