Year | Value | 2022 | 68.961784771502 | 2021 | 68.190581464641 | 2020 | 71.761564629812 | 2019 | 72.166784223947 | 2018 | 70.690581333023 | 2017 | 72.989105956629 | 2016 | 74.141564362021 | 2015 | 73.826786752736 | 2014 | 74.3877544029 | 2013 | 75.32181900679 | 2012 | 76.036191882737 | 2011 | 76.313442573788 | 2010 | 77.553684507079 | 2009 | 77.230324527983 | 2008 | 74.676658337596 | 2007 | 75.470267473988 | 2006 | 74.624507042795 | 2005 | 75.586207615753 | 2004 | 76.59461692886 | 2003 | 77.904118255753 | 2002 | 76.664566475914 | 2001 | 77.482157524497 | 2000 | 78.873835099156 | 1999 | 78.704188650788 | 1998 | 75.182099168845 | 1997 | 80.296482127518 | 1996 | 78.844149158866 | 1995 | 81.097346238132 | 1994 | 81.615028177717 | 1993 | 81.987253332981 | 1992 | 82.458412903981 | 1991 | 83.020563327218 | 1990 | 79.541479905623 | 1989 | 74.950324185006 | 1988 | 71.106949533564 | 1987 | 76.100714783751 | 1986 | 61.549982086677 | 1985 | 65.717257198216 | 1984 | 71.408958453614 | 1983 | 71.665060622186 | 1982 | 69.367720783058 | 1981 | 69.07353499557 | 1980 | 72.704852215807 | 1979 | 67.222202224542 | 1978 | 70.061318667425 | 1977 | 69.374230805642 | 1976 | 67.492711370262 | 1975 | 69.965870307167 | 1974 | 71.561113352158 | 1973 | 69.065934065934 | 1972 | 67.277758561051 | 1971 | 67.670103092784 | 1970 | 62.544529262086 | 1969 | 61.01598173516 | 1968 | 61.079365079365 | 1967 | 61.434659090909 | 1966 | 62.017336485422 | 1965 | 62.766945218199 | 1964 | 63.419483101392 | 1963 | 64.377682403433 | 1962 | 65.255292652553 | 1961 | 65.646731571627 | 1960 | 64.757709251101 |
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