Year | Value | 2021 | 71.907356144081 | 2020 | 72.836303319035 | 2019 | 74.961996874306 | 2018 | 74.771981077437 | 2017 | 74.642822784694 | 2016 | 74.471751801634 | 2015 | 74.472265270885 | 2014 | 74.428491924057 | 2013 | 74.191063943735 | 2012 | 73.937634455693 | 2011 | 73.694306321609 | 2010 | 73.17970893529 | 2009 | 73.308681233215 | 2008 | 73.103940424317 | 2007 | 72.846279684959 | 2006 | 72.696176813164 | 2005 | 72.472854616451 | 2004 | 72.091692877139 | 2003 | 71.780180472446 | 2002 | 71.536991087633 | 2001 | 71.254533198399 | 2000 | 70.906512445042 | 1999 | 70.604105055939 | 1998 | 70.148294106114 | 1997 | 69.874318793383 | 1996 | 69.532215494513 | 1995 | 69.128866170375 | 1994 | 68.804469557509 | 1993 | 68.397898870299 | 1992 | 68.049199255963 | 1991 | 67.703189937822 | 1990 | 67.362054115053 | 1989 | 67.065808765578 | 1988 | 66.690412188574 | 1987 | 66.246036122514 | 1986 | 65.806544396916 | 1985 | 65.200124212425 | 1984 | 64.87721661981 | 1983 | 64.449077949411 | 1982 | 63.855434880423 | 1981 | 63.517610189388 | 1980 | 63.048613536443 | 1979 | 62.609728289838 | 1978 | 62.244537770092 | 1977 | 61.879961915831 | 1976 | 61.332187604033 | 1975 | 61.079226697119 | 1974 | 60.567878333169 | 1973 | 60.171716775842 | 1972 | 59.654831047152 | 1971 | 59.25115141704 | 1970 | 58.385043416829 | 1969 | 58.37664485582 | 1968 | 58.010035168764 | 1967 | 57.64894634125 | 1966 | 57.284105014504 | 1965 | 56.855169188065 | 1964 | 56.471034777363 | 1963 | 55.989641287649 | 1962 | 55.526591022642 | 1961 | 55.045468350907 | 1960 | 54.494935973526 |
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