Year | Value | 2021 | 82.648153496232 | 2020 | 82.84465278066 | 2019 | 83.616314165219 | 2018 | 83.383325409649 | 2017 | 83.296336890977 | 2016 | 83.287830757335 | 2015 | 83.118311621029 | 2014 | 83.292372635217 | 2013 | 83.045269981118 | 2012 | 82.897098466727 | 2011 | 82.816868477991 | 2010 | 82.574133088239 | 2009 | 82.41644178817 | 2008 | 82.134365303962 | 2007 | 82.036083453533 | 2006 | 81.8140818212 | 2005 | 81.498775102927 | 2004 | 81.429119631867 | 2003 | 81.019131037639 | 2002 | 80.93441539814 | 2001 | 80.817406462001 | 2000 | 80.558609730604 | 1999 | 80.364206700791 | 1998 | 80.304527901438 | 1997 | 80.128657631809 | 1996 | 79.851572031566 | 1995 | 79.560892852439 | 1994 | 79.574791972988 | 1993 | 79.261078795466 | 1992 | 79.295983070538 | 1991 | 79.12165225088 | 1990 | 78.989128118377 | 1989 | 78.830308278136 | 1988 | 78.568835217191 | 1987 | 78.476475979946 | 1986 | 78.189347311327 | 1985 | 77.912365654497 | 1984 | 77.825699955524 | 1983 | 77.546927683958 | 1982 | 77.472194565398 | 1981 | 77.147901810371 | 1980 | 76.811092077824 | 1979 | 76.824447396804 | 1978 | 76.467877191503 | 1977 | 76.305121036628 | 1976 | 75.868233421455 | 1975 | 75.602991291409 | 1974 | 75.232421103415 | 1973 | 74.860467943376 | 1972 | 74.681367255894 | 1971 | 74.454554072968 | 1970 | 74.128898347937 | 1969 | 73.877320450618 | 1968 | 73.745079842525 | 1967 | 73.79038591634 | 1966 | 73.429966230994 | 1965 | 73.149497656988 | 1964 | 73.053049705136 | 1963 | 72.50053665833 | 1962 | 72.216800378923 | 1961 | 72.201658230683 | 1960 | 71.774028089813 |
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