Year | Value | 2022 | 75.534534724732 | 2021 | 75.871684805157 | 2020 | 75.400146195145 | 2019 | 75.75315394942 | 2018 | 75.987526878036 | 2017 | 75.947079332394 | 2016 | 78.002740003126 | 2015 | 78.855642547958 | 2014 | 79.028695437826 | 2013 | 78.719759593972 | 2012 | 78.139347483299 | 2011 | 76.523500237376 | 2010 | 76.316418894139 | 2009 | 76.213087423726 | 2008 | 70.8866754176 | 2007 | 69.342285323298 | 2006 | 71.138886157655 | 2005 | 71.048716656445 | 2004 | 70.564003073861 | 2003 | 70.750383857554 | 2002 | 68.880567864984 | 2001 | 67.477943413447 | 2000 | 67.53785491271 | 1999 | 69.103974282202 | 1998 | 69.66316383618 | 1997 | 71.407041071412 | 1996 | 73.704730464426 | 1995 | 72.853098458635 | 1994 | 74.95179010237 | 1993 | 77.172492649461 | 1992 | 78.284305630912 | 1991 | 77.091796223202 | 1990 | 70.925361976275 | 1989 | 69.681340303408 | 1988 | 70.409134157945 | 1987 | 72.45997991612 | 1986 | 72.089387969949 | 1985 | 71.770967465019 | 1984 | 70.727646838758 | 1983 | 71.370832635282 | 1982 | 71.226315912436 | 1981 | 70.144744792077 | 1980 | 69.5932495469 | 1979 | 70.339812756201 | 1978 | 71.824854282948 | 1977 | 72.173334988341 | 1976 | 71.261006389729 | 1975 | 69.736034218692 | 1974 | 66.01903415055 | 1973 | 67.557448376685 | 1972 | 69.123959409051 | 1971 | 68.585385063132 | 1970 | 68.529381337289 |
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