Year | Value | 2021 | 84.298023368024 | 2020 | 84.160462775535 | 2019 | 84.896481780602 | 2018 | 84.64514768513 | 2017 | 84.523567212591 | 2016 | 84.647895227266 | 2015 | 84.240774729694 | 2014 | 84.708557514387 | 2013 | 84.29558948163 | 2012 | 84.05989411045 | 2011 | 84.150219983291 | 2010 | 83.65417946558 | 2009 | 83.43590402315 | 2008 | 83.252006600808 | 2007 | 83.133146079086 | 2006 | 82.938452047477 | 2005 | 82.504773709084 | 2004 | 82.396411922225 | 2003 | 81.801781323152 | 2002 | 81.876800273465 | 2001 | 81.844525150356 | 2000 | 81.548770860032 | 1999 | 81.328025248055 | 1998 | 81.136183337997 | 1997 | 80.975161238301 | 1996 | 80.683837105067 | 1995 | 80.473368622472 | 1994 | 80.327684292506 | 1993 | 80.01717877461 | 1992 | 79.954187427763 | 1991 | 79.592745444691 | 1990 | 79.39903969058 | 1989 | 79.31526927683 | 1988 | 79.103505383615 | 1987 | 78.909172538779 | 1986 | 78.550613627817 | 1985 | 78.294823371399 | 1984 | 78.182996892207 | 1983 | 77.758615269967 | 1982 | 77.690274163728 | 1981 | 77.358554336016 | 1980 | 77.083493561232 | 1979 | 76.924516587847 | 1978 | 76.564038137336 | 1977 | 76.389339614496 | 1976 | 75.897377375961 | 1975 | 75.544603721019 | 1974 | 75.436489347308 | 1973 | 75.043272672161 | 1972 | 74.922451112832 | 1971 | 74.538362355649 | 1970 | 74.331423186892 | 1969 | 73.902082678077 | 1968 | 73.905221609265 | 1967 | 73.960507367608 | 1966 | 73.733322467301 | 1965 | 73.452500637352 | 1964 | 73.357386639158 | 1963 | 72.735871238532 | 1962 | 72.521694810429 | 1961 | 72.499986928117 | 1960 | 72.020572425303 |
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