Year | Value | 2017 | 62.089492578296 | 2016 | 62.963129255695 | 2015 | 61.810662614296 | 2014 | 64.067113502426 | 2013 | 63.302770400812 | 2012 | 63.987365723713 | 2011 | 67.389289182449 | 2010 | 69.976897915902 | 2009 | 67.921036634795 | 2008 | 68.19198587165 | 2007 | 70.609086947012 | 2006 | 74.525283821365 | 2005 | 77.141494684576 | 2004 | 79.588996261915 | 2003 | 77.899986455363 | 2002 | 81.106592620721 | 2001 | 77.506061543655 | 2000 | 74.981969853175 | 1999 | 77.339611290192 | 1998 | 76.633387949901 | 1997 | 71.719686334901 | 1996 | 73.86002666128 | 1995 | 74.37995163829 | 1994 | 76.200107550329 | 1993 | 79.20274137044 | 1992 | 80.45041306833 | 1991 | 85.24253303208 | 1990 | 83.593543454606 | 1989 | 94.77955095758 | 1988 | 84.457445956767 | 1987 | 81.065258134431 | 1986 | 81.39652332209 | 1985 | 84.256937889836 | 1984 | 84.565679221345 | 1983 | 74.87023055761 | 1982 | 67.622347512454 | 1981 | 72.423321250496 | 1980 | 69.510280518371 | 1979 | 74.032395715584 | 1978 | 71.577958246771 | 1977 | 73.299526243271 | 1976 | 69.125360398685 | 1975 | 70.100518452706 | 1974 | 69.471001243153 | 1973 | 64.503253067964 | 1972 | 67.03504582883 | 1971 | 67.291116603973 | 1970 | 69.232529172327 | 1969 | 69.78794088982 | 1968 | 69.112684312446 | 1967 | 71.800565055429 | 1966 | 72.549145002385 | 1965 | 76.005263668476 | 1964 | 76.905741572853 | 1963 | 76.309287208013 | 1962 | 74.291116877254 | 1961 | 76.295464823498 | 1960 | 80.041500736018 |
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