Year | Value | 2021 | 75.085080370344 | 2020 | 75.321681703515 | 2019 | 76.246401621071 | 2018 | 76.194283995101 | 2017 | 76.086039027746 | 2016 | 75.562196332412 | 2015 | 75.142269746167 | 2014 | 74.936272174394 | 2013 | 74.689239662002 | 2012 | 74.591109216857 | 2011 | 74.588558188108 | 2010 | 74.303776833368 | 2009 | 73.953489898425 | 2008 | 73.687176384751 | 2007 | 73.595957488996 | 2006 | 73.2729595579 | 2005 | 72.912498295515 | 2004 | 72.58351616069 | 2003 | 72.018822435267 | 2002 | 72.063743933187 | 2001 | 71.724610078912 | 2000 | 71.401138739645 | 1999 | 70.959521702695 | 1998 | 70.49337775547 | 1997 | 70.320670993509 | 1996 | 70.033670087052 | 1995 | 69.605740312713 | 1994 | 69.298054889529 | 1993 | 68.965608807079 | 1992 | 68.662602289528 | 1991 | 68.16186735296 | 1990 | 67.097423151313 | 1989 | 67.056598521751 | 1988 | 66.649513826216 | 1987 | 66.244406562568 | 1986 | 65.766847977733 | 1985 | 65.078189712114 | 1984 | 64.286250044679 | 1983 | 63.431364364657 | 1982 | 61.998578432344 | 1981 | 61.33353585485 | 1980 | 60.68439626545 | 1979 | 59.840744612425 | 1978 | 58.554677202201 | 1977 | 57.95859091572 | 1976 | 56.754507477485 | 1975 | 56.315798127139 | 1974 | 55.542856519369 | 1973 | 54.744793368856 | 1972 | 53.894179919123 | 1971 | 53.34377649577 | 1970 | 52.667918207835 | 1969 | 52.059058104526 | 1968 | 51.398897043247 | 1967 | 50.985905657947 | 1966 | 50.447382952656 | 1965 | 49.337452980597 | 1964 | 48.722777089289 | 1963 | 48.079051376961 | 1962 | 47.722404195273 | 1961 | 47.352968815733 | 1960 | 46.082561631549 |
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