Year | Value | 2021 | 72.124192550282 | 2020 | 73.379314610788 | 2019 | 74.129115402274 | 2018 | 73.932648191308 | 2017 | 73.639912964471 | 2016 | 73.417375199878 | 2015 | 73.14969690836 | 2014 | 72.849388535306 | 2013 | 72.492209303756 | 2012 | 72.142229934143 | 2011 | 71.795317598534 | 2010 | 71.452421570592 | 2009 | 71.167372220558 | 2008 | 70.789432089422 | 2007 | 70.571640760029 | 2006 | 70.280134288974 | 2005 | 69.923443616643 | 2004 | 69.501039821609 | 2003 | 69.256479228182 | 2002 | 68.987585333633 | 2001 | 68.654606692655 | 2000 | 68.241631257847 | 1999 | 67.901106261726 | 1998 | 67.693468483404 | 1997 | 67.328691300914 | 1996 | 66.955417285294 | 1995 | 66.631650965204 | 1994 | 66.292540361324 | 1993 | 66.023252502615 | 1992 | 65.771463902148 | 1991 | 65.474766906756 | 1990 | 65.195376591163 | 1989 | 64.988311776496 | 1988 | 64.643994287986 | 1987 | 64.342616316548 | 1986 | 63.986820617007 | 1985 | 63.49195077612 | 1984 | 63.073837764313 | 1983 | 62.669869220112 | 1982 | 62.219342677771 | 1981 | 61.758893939089 | 1980 | 61.313894079339 | 1979 | 60.880881470534 | 1978 | 60.382111962476 | 1977 | 59.903790831566 | 1976 | 59.34669802235 | 1975 | 58.800861269942 | 1974 | 58.197200021327 | 1973 | 57.638937077675 | 1972 | 56.974096456875 | 1971 | 56.521865820494 | 1970 | 55.891193493741 | 1969 | 55.347522384224 | 1968 | 54.939072302256 | 1967 | 54.241653161153 | 1966 | 53.753093545507 | 1965 | 53.062283693202 | 1964 | 53.354844332211 | 1963 | 52.832885270627 | 1962 | 52.359673411617 | 1961 | 48.669649500641 | 1960 | 45.831547391341 |
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