Year | Value | 2021 | 67.382708586496 | 2020 | 68.415823535255 | 2019 | 69.202280671191 | 2018 | 69.00458498962 | 2017 | 68.704337628008 | 2016 | 68.502304783363 | 2015 | 68.237628835144 | 2014 | 67.93468687112 | 2013 | 67.5805184538 | 2012 | 67.268325805788 | 2011 | 66.976474318678 | 2010 | 66.622529010338 | 2009 | 66.326761947167 | 2008 | 65.933380176543 | 2007 | 65.740484358513 | 2006 | 65.490346777569 | 2005 | 65.123776989709 | 2004 | 64.765274504599 | 2003 | 64.53292633376 | 2002 | 64.276322296463 | 2001 | 63.956054450955 | 2000 | 63.656919359562 | 1999 | 63.340902390629 | 1998 | 62.957573034595 | 1997 | 62.67853465623 | 1996 | 62.316540241526 | 1995 | 62.012646953049 | 1994 | 61.735506558102 | 1993 | 61.442403808073 | 1992 | 61.257645900251 | 1991 | 60.989433665246 | 1990 | 60.758259299499 | 1989 | 60.579030955374 | 1988 | 60.180193110876 | 1987 | 59.992737066837 | 1986 | 59.668948448103 | 1985 | 59.207935497139 | 1984 | 58.821646777463 | 1983 | 58.487794522513 | 1982 | 58.192587689995 | 1981 | 57.823885216626 | 1980 | 57.459468612754 | 1979 | 57.078555897823 | 1978 | 56.650681314194 | 1977 | 56.26429905216 | 1976 | 55.791903545086 | 1975 | 55.267757986606 | 1974 | 54.761147161643 | 1973 | 54.327061975176 | 1972 | 53.700855111186 | 1971 | 52.498833357162 | 1970 | 52.556539165897 | 1969 | 52.187050127508 | 1968 | 51.789803894457 | 1967 | 51.125730854035 | 1966 | 50.668400796842 | 1965 | 49.949221186986 | 1964 | 50.274682170139 | 1963 | 49.741028168257 | 1962 | 49.300704486804 | 1961 | 46.240218242861 | 1960 | 43.877099550446 |
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