Year | Value | 2022 | 82.869770476853 | 2021 | 83.247557091006 | 2020 | 82.545717249535 | 2019 | 81.532891215891 | 2018 | 81.790903053609 | 2017 | 82.179305983301 | 2016 | 82.268691156659 | 2015 | 81.848890605963 | 2014 | 82.257364711066 | 2013 | 82.638604560055 | 2012 | 83.443005857775 | 2011 | 84.682039942242 | 2010 | 84.865002156955 | 2009 | 85.126348418683 | 2008 | 83.978621018164 | 2007 | 82.526867088657 | 2006 | 82.154953261997 | 2005 | 82.29871206938 | 2004 | 82.53843445523 | 2003 | 82.810421997054 | 2002 | 82.300915335356 | 2001 | 81.383567873978 | 2000 | 80.039104699401 | 1999 | 79.275741590191 | 1998 | 78.837022223653 | 1997 | 78.779074313955 | 1996 | 79.491973489314 | 1995 | 79.902271658401 | 1994 | 79.990081287336 | 1993 | 80.556630044299 | 1992 | 80.455198029179 | 1991 | 80.354049095107 | 1990 | 79.776373000551 | 1989 | 79.023713215092 | 1988 | 79.261265004952 | 1987 | 79.361511282199 | 1986 | 79.138843282352 | 1985 | 78.439420886803 | 1984 | 77.448433022184 | 1983 | 79.168076943609 | 1982 | 78.527263532478 | 1981 | 76.113526456319 | 1980 | 77.146662924215 | 1979 | 75.746964697661 | 1978 | 76.246928153992 | 1977 | 77.583044884635 | 1976 | 78.048662013481 | 1975 | 78.774339665643 | 1974 | 77.357800682482 | 1973 | 76.379846440518 | 1972 | 77.68299833478 | 1971 | 78.026956260463 | 1970 | 78.217427883832 |
|