Year | Value | 2021 | 75.543291297684 | 2020 | 75.936024637032 | 2019 | 76.002020300205 | 2018 | 75.801433724838 | 2017 | 75.38591131605 | 2016 | 75.321863219062 | 2015 | 75.123035173319 | 2014 | 74.903268569544 | 2013 | 74.644746462662 | 2012 | 74.395772696441 | 2011 | 74.147034583411 | 2010 | 73.876172899762 | 2009 | 73.649612138624 | 2008 | 73.097870964883 | 2007 | 73.149460893312 | 2006 | 72.906533492717 | 2005 | 72.555360154565 | 2004 | 72.026608864089 | 2003 | 71.948536270045 | 2002 | 71.500192356886 | 2001 | 71.153292350196 | 2000 | 70.564835704778 | 1999 | 70.193594892328 | 1998 | 69.980208983269 | 1997 | 69.56051513971 | 1996 | 69.170605386322 | 1995 | 68.915165038464 | 1994 | 68.617200698859 | 1993 | 68.351271488994 | 1992 | 67.879975794984 | 1991 | 67.358427110155 | 1990 | 67.136587957635 | 1989 | 66.919310592525 | 1988 | 66.595759408004 | 1987 | 66.315779547906 | 1986 | 65.966852728666 | 1985 | 65.619284500795 | 1984 | 65.238249526544 | 1983 | 64.843477212369 | 1982 | 64.422512918026 | 1981 | 63.939396869837 | 1980 | 63.438609516363 | 1979 | 62.886789954041 | 1978 | 62.269707469591 | 1977 | 61.637896359315 | 1976 | 60.885581415432 | 1975 | 60.050774825699 | 1974 | 59.289556903192 | 1973 | 58.644670504466 | 1972 | 57.688905184504 | 1971 | 57.089994012552 | 1970 | 56.237375022228 | 1969 | 55.5256071848 | 1968 | 54.818425204157 | 1967 | 54.337567108442 | 1966 | 53.462655012121 | 1965 | 52.287625515089 | 1964 | 52.359259125247 | 1963 | 51.630961431872 | 1962 | 51.127778588616 | 1961 | 43.358706048623 | 1960 | 37.754070131069 |
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