Year | Value | 2021 | 74.40676666208 | 2020 | 74.70955403966 | 2019 | 75.62756314013 | 2018 | 75.573230676544 | 2017 | 75.470868626465 | 2016 | 74.89553930934 | 2015 | 74.439040285651 | 2014 | 74.231554281922 | 2013 | 73.967976836824 | 2012 | 73.895646183812 | 2011 | 73.932429681522 | 2010 | 73.640900310279 | 2009 | 73.321372060357 | 2008 | 73.055264796688 | 2007 | 73.00351112105 | 2006 | 72.669369797265 | 2005 | 72.30334941759 | 2004 | 71.96015430766 | 2003 | 71.397373520164 | 2002 | 71.494147747412 | 2001 | 71.150511170294 | 2000 | 70.821227880029 | 1999 | 70.370873057372 | 1998 | 69.894587701001 | 1997 | 69.730080587803 | 1996 | 69.437365930545 | 1995 | 69.00677110327 | 1994 | 68.684481416641 | 1993 | 68.358527248803 | 1992 | 68.07256165704 | 1991 | 67.570459456463 | 1990 | 66.430859327065 | 1989 | 66.419568407261 | 1988 | 66.084826594292 | 1987 | 65.644198435261 | 1986 | 65.173379822458 | 1985 | 64.454057467259 | 1984 | 63.645329480905 | 1983 | 62.763995609699 | 1982 | 61.257405770338 | 1981 | 60.573912779937 | 1980 | 59.921144740106 | 1979 | 59.083601672598 | 1978 | 57.740753337324 | 1977 | 57.173957821313 | 1976 | 55.91370263662 | 1975 | 55.521620334993 | 1974 | 54.757954186532 | 1973 | 53.962534547026 | 1972 | 53.145123430119 | 1971 | 52.582163332112 | 1970 | 51.931230959004 | 1969 | 51.339908390412 | 1968 | 50.682525577034 | 1967 | 50.287237767133 | 1966 | 49.753567807952 | 1965 | 49.169584126426 | 1964 | 48.559960648959 | 1963 | 47.924106577246 | 1962 | 46.99663276922 | 1961 | 46.664807594177 | 1960 | 45.93245360613 |
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