Year | Value | 2021 | 80.773041694384 | 2020 | 80.773213812224 | 2019 | 80.76347519875 | 2018 | 80.753736585275 | 2017 | 80.754015695286 | 2016 | 80.768389860864 | 2015 | 80.773041694384 | 2014 | 80.744339881564 | 2013 | 80.613948987994 | 2012 | 80.637208155594 | 2011 | 80.657211039731 | 2010 | 80.665584340068 | 2009 | 80.679074657276 | 2008 | 80.742804776503 | 2007 | 80.79071866176 | 2006 | 80.790253478409 | 2005 | 80.810256362545 | 2004 | 80.806534895729 | 2003 | 80.847936214059 | 2002 | 80.845610297299 | 2001 | 80.844679930595 | 2000 | 80.841888830483 | 1999 | 80.841888830483 | 1998 | 77.585605366355 | 1997 | 73.86413855021 | 1996 | 70.607855086082 | 1995 | 67.351571621955 | 1994 | 64.095288157827 | 1993 | 60.8390046937 | 1992 | 57.564579078844 | 1991 | 57.530155510795 | 1990 | 57.441305490559 | 1989 | 55.026538710233 | 1988 | 52.626192613819 | 1987 | 50.230498350925 | 1986 | 47.81154492043 | 1985 | 45.413524740777 | 1984 | 42.993640943578 | 1983 | 40.596551130628 | 1982 | 40.50258409352 | 1981 | 40.476999009159 | 1980 | 40.453274658207 | 1979 | 40.42861994055 | 1978 | 40.403965222893 | 1977 | 40.379775688588 | 1976 | 40.354655787579 | 1975 | 40.323953686345 | 1974 | 40.303485618857 | 1973 | 40.270922784215 | 1972 | 40.246268066558 | 1971 | 40.223008898958 | 1970 | 40.201145281413 | 1969 | 40.180212030572 | 1968 | 40.163930613251 | 1967 | 40.147184012579 | 1966 | 40.137880345538 | 1965 | 40.127646311794 | 1964 | 40.117877461401 | 1963 | 40.104387144193 | 1962 | 40.094153110449 | 1961 | 40.084849443408 |
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