Year | Value | 2021 | 76.339963479796 | 2020 | 76.722906436856 | 2019 | 76.992906430212 | 2018 | 76.770634121386 | 2017 | 76.400336407299 | 2016 | 76.258070706988 | 2015 | 76.012968428538 | 2014 | 75.79063086071 | 2013 | 75.521016903273 | 2012 | 75.226310786259 | 2011 | 74.949062798467 | 2010 | 74.615112982129 | 2009 | 74.332462946637 | 2008 | 73.921035668367 | 2007 | 73.743271903817 | 2006 | 73.450904473677 | 2005 | 73.031422358477 | 2004 | 72.637812933834 | 2003 | 72.3339155934 | 2002 | 71.921445253197 | 2001 | 71.624072216843 | 2000 | 71.078675285985 | 1999 | 70.763043001602 | 1998 | 70.61190492064 | 1997 | 70.183279064791 | 1996 | 69.759047966232 | 1995 | 69.409080932776 | 1994 | 69.143436881015 | 1993 | 68.938316352387 | 1992 | 68.701633868138 | 1991 | 68.400028868489 | 1990 | 68.253417547729 | 1989 | 68.115144639381 | 1988 | 67.880662958554 | 1987 | 67.651870185271 | 1986 | 67.34111137778 | 1985 | 66.856317881388 | 1984 | 66.518882757895 | 1983 | 66.203449864201 | 1982 | 65.825195812823 | 1981 | 65.387774454079 | 1980 | 64.876188006412 | 1979 | 64.402228453695 | 1978 | 63.911568479139 | 1977 | 63.381863878114 | 1976 | 62.782571695688 | 1975 | 62.161219224174 | 1974 | 61.452782153796 | 1973 | 60.902085822502 | 1972 | 60.091125624001 | 1971 | 59.599334311384 | 1970 | 58.889352803375 | 1969 | 58.139730433528 | 1968 | 57.689924176726 | 1967 | 57.323129418468 | 1966 | 56.903636670172 | 1965 | 56.392955290655 | 1964 | 55.910669652144 | 1963 | 55.268230947431 | 1962 | 54.787717060101 | 1961 | 48.515713676597 | 1960 | 43.834224930135 |
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