Year | Value | 2021 | 70.640332856669 | 2020 | 70.812576157415 | 2019 | 71.862269265356 | 2018 | 71.642445876465 | 2017 | 71.368279644075 | 2016 | 70.96616310223 | 2015 | 70.832811399587 | 2014 | 70.517107966529 | 2013 | 70.216333510093 | 2012 | 70.179058736145 | 2011 | 70.331414587629 | 2010 | 70.08112721281 | 2009 | 69.843103740048 | 2008 | 69.430785655576 | 2007 | 68.992821812637 | 2006 | 68.631307110037 | 2005 | 68.528952209975 | 2004 | 68.264237676015 | 2003 | 67.862191526767 | 2002 | 68.029848732323 | 2001 | 67.685437698928 | 2000 | 67.320948301777 | 1999 | 67.032638139968 | 1998 | 66.642031606469 | 1997 | 66.354243438388 | 1996 | 66.101272640264 | 1995 | 65.742960785756 | 1994 | 65.431238908997 | 1993 | 65.35389125719 | 1992 | 65.0011039412 | 1991 | 64.375495822276 | 1990 | 63.190542583242 | 1989 | 63.1846988649 | 1988 | 61.888225704023 | 1987 | 61.527622538453 | 1986 | 60.665326456749 | 1985 | 60.215870420207 | 1984 | 59.461029812987 | 1983 | 57.944662351002 | 1982 | 56.428416583125 | 1981 | 56.062254908963 | 1980 | 56.636299806452 | 1979 | 56.584397961362 | 1978 | 55.484100421831 | 1977 | 54.944567641468 | 1976 | 53.678283434434 | 1975 | 53.138841588118 | 1974 | 52.62403709483 | 1973 | 51.794215437757 | 1972 | 51.388284088419 | 1971 | 50.800066794285 | 1970 | 50.094681653563 | 1969 | 49.51731577302 | 1968 | 48.949550969188 | 1967 | 48.499310944776 | 1966 | 48.080479718315 | 1965 | 47.129266851112 | 1964 | 46.519811532824 | 1963 | 45.818357881656 | 1962 | 45.046491150249 | 1961 | 44.776939423433 | 1960 | 43.547723708471 |
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