Year | Value | 2021 | 79.566273566772 | 2020 | 79.991602565233 | 2019 | 80.148862559503 | 2018 | 79.961565262403 | 2017 | 79.702732427705 | 2016 | 79.462188059239 | 2015 | 79.175501101749 | 2014 | 78.951294057343 | 2013 | 78.688039904501 | 2012 | 78.424205987207 | 2011 | 78.134301156541 | 2010 | 77.807976580584 | 2009 | 77.540288458573 | 2008 | 77.138978976382 | 2007 | 77.003656764273 | 2006 | 76.694424593506 | 2005 | 76.316185465068 | 2004 | 75.913451768706 | 2003 | 75.605278282434 | 2002 | 75.185577667965 | 2001 | 74.893733597631 | 2000 | 74.145014930203 | 1999 | 73.700727620395 | 1998 | 73.696540754545 | 1997 | 73.177697897446 | 1996 | 72.799352392625 | 1995 | 72.518021011335 | 1994 | 72.216623960717 | 1993 | 72.005284033635 | 1992 | 71.606808162227 | 1991 | 71.284534086923 | 1990 | 71.30618700808 | 1989 | 71.147479916249 | 1988 | 70.87181079325 | 1987 | 70.610612099041 | 1986 | 70.269090022375 | 1985 | 69.789415973325 | 1984 | 69.478281053762 | 1983 | 69.157811285149 | 1982 | 68.76354819149 | 1981 | 68.318718005533 | 1980 | 67.800764778235 | 1979 | 67.299881831214 | 1978 | 66.792062799668 | 1977 | 66.232534990635 | 1976 | 65.592548241676 | 1975 | 64.992926535935 | 1974 | 64.297229262537 | 1973 | 63.651938655545 | 1972 | 62.856632524749 | 1971 | 62.348452541887 | 1970 | 61.687188803917 | 1969 | 60.928763207437 | 1968 | 60.513185076347 | 1967 | 60.120339772771 | 1966 | 59.723258979922 | 1965 | 59.237197547361 | 1964 | 58.714566523551 | 1963 | 58.100799093113 | 1962 | 57.623529484267 | 1961 | 51.179830074465 | 1960 | 46.373457587526 |
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