Year | Value | 2022 | 81.465623381355 | 2021 | 81.24050338642 | 2020 | 81.027719478987 | 2019 | 80.813586872816 | 2018 | 80.601068185456 | 2017 | 80.395250467355 | 2016 | 80.191552825668 | 2015 | 79.991247691883 | 2014 | 79.793588961664 | 2013 | 79.59994757525 | 2012 | 79.4053314814 | 2011 | 79.207911685224 | 2010 | 78.982548154392 | 2009 | 78.696772987761 | 2008 | 78.404205748479 | 2007 | 78.102544850111 | 2006 | 77.788656770153 | 2005 | 77.460786108341 | 2004 | 77.106703571207 | 2003 | 76.738362750741 | 2002 | 76.35451659099 | 2001 | 75.951472012215 | 2000 | 75.60232110124 | 1999 | 75.363679784325 | 1998 | 75.123691613718 | 1997 | 74.884441458217 | 1996 | 74.64460215452 | 1995 | 74.395462480573 | 1994 | 74.124852378107 | 1993 | 73.85246178941 | 1992 | 73.584925298013 | 1991 | 73.321204770137 | 1990 | 73.038275698521 | 1989 | 72.757886746412 | 1988 | 72.495040944472 | 1987 | 72.210810716675 | 1986 | 71.923777813871 | 1985 | 71.655855213857 | 1984 | 71.394286253229 | 1983 | 71.133849765254 | 1982 | 70.864238585711 | 1981 | 70.578522476189 | 1980 | 70.273322203336 | 1979 | 70.016286187678 | 1978 | 69.76029955272 | 1977 | 69.500495442009 | 1976 | 69.242783457456 | 1975 | 68.973140148768 | 1974 | 68.634449053184 | 1973 | 68.277943941477 | 1972 | 67.917620161531 | 1971 | 67.547655327924 | 1970 | 67.143124944498 | 1969 | 66.679844353124 | 1968 | 66.201905658069 | 1967 | 65.703666068394 | 1966 | 65.197417762904 | 1965 | 64.7005462437 | 1964 | 64.200562271195 | 1963 | 63.686420071403 | 1962 | 63.17252191556 | 1961 | 62.674582690895 | 1960 | 62.176648856174 |
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