Year | Value | 2021 | 74.693157590408 | 2020 | 75.139003516515 | 2019 | 75.945623628271 | 2018 | 75.72575526119 | 2017 | 75.352557866371 | 2016 | 75.179861827117 | 2015 | 74.994212974247 | 2014 | 74.77740401237 | 2013 | 74.516477655783 | 2012 | 74.223216234591 | 2011 | 73.914901303761 | 2010 | 73.606414261965 | 2009 | 73.359879232744 | 2008 | 72.93738719536 | 2007 | 72.745341027068 | 2006 | 72.46592176541 | 2005 | 72.081488990259 | 2004 | 71.616613720427 | 2003 | 71.471927225358 | 2002 | 71.218560379741 | 2001 | 70.951499594029 | 2000 | 70.466935643859 | 1999 | 70.138576265047 | 1998 | 70.004011903284 | 1997 | 69.620486223253 | 1996 | 69.236047357252 | 1995 | 68.915748894304 | 1994 | 68.557131598648 | 1993 | 68.296488678415 | 1992 | 68.071007587273 | 1991 | 67.765799261489 | 1990 | 67.577500860884 | 1989 | 67.394477888322 | 1988 | 67.122983568599 | 1987 | 66.897400936192 | 1986 | 66.57663723369 | 1985 | 66.087813946141 | 1984 | 65.692869505492 | 1983 | 65.343392228256 | 1982 | 64.918673849899 | 1981 | 64.461216845842 | 1980 | 64.00344366284 | 1979 | 63.542541159335 | 1978 | 63.058008643368 | 1977 | 62.541607710338 | 1976 | 61.960712944845 | 1975 | 61.356524824826 | 1974 | 60.835219709518 | 1973 | 60.25718174008 | 1972 | 59.553149077999 | 1971 | 58.921964693975 | 1970 | 58.147116638709 | 1969 | 57.473267521634 | 1968 | 57.021225046093 | 1967 | 56.523700925062 | 1966 | 55.868573117931 | 1965 | 54.953398043047 | 1964 | 54.994378449238 | 1963 | 54.347225913474 | 1962 | 53.816889249426 | 1961 | 48.001359417237 | 1960 | 43.652138732026 |
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