Year | Value | 2022 | 73.057533706017 | 2021 | 72.814203929025 | 2020 | 72.607102996553 | 2019 | 72.404039977881 | 2018 | 72.201480789315 | 2017 | 72.006014535873 | 2016 | 71.817361894022 | 2015 | 71.633245526434 | 2014 | 71.454632366766 | 2013 | 71.283225171068 | 2012 | 71.110949623476 | 2011 | 70.935365081366 | 2010 | 70.75810258471 | 2009 | 70.562775426898 | 2008 | 70.358696348032 | 2007 | 70.14643396285 | 2006 | 69.929447364776 | 2005 | 69.715032231541 | 2004 | 69.499527502927 | 2003 | 69.286525101995 | 2002 | 69.075923442226 | 2001 | 68.875059893176 | 2000 | 68.719975293186 | 1999 | 68.591052022371 | 1998 | 68.473865942769 | 1997 | 68.365630533758 | 1996 | 68.263222909441 | 1995 | 68.161579669615 | 1994 | 68.048941329856 | 1993 | 67.937450082834 | 1992 | 67.832667608484 | 1991 | 67.72162351829 | 1990 | 67.592224161964 | 1989 | 67.447939497059 | 1988 | 67.246630092029 | 1987 | 66.969353665289 | 1986 | 66.691015298444 | 1985 | 66.433018060974 | 1984 | 66.169398126582 | 1983 | 65.896280399855 | 1982 | 65.612670056251 | 1981 | 65.310372576912 | 1980 | 64.973134877595 | 1979 | 64.663170972164 | 1978 | 64.309397932458 | 1977 | 63.919462341313 | 1976 | 63.53371505445 | 1975 | 63.150359948126 | 1974 | 62.741029808732 | 1973 | 62.298900897686 | 1972 | 61.846868617375 | 1971 | 61.381486928121 | 1970 | 60.905873284292 | 1969 | 60.415768625102 | 1968 | 59.917997924325 | 1967 | 59.392688920559 | 1966 | 58.84923021447 | 1965 | 58.291327214421 | 1964 | 57.730569309876 | 1963 | 57.179623176961 | 1962 | 56.628028564755 | 1961 | 56.101722899083 | 1960 | 55.573145909605 |
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