Year | Value | 2021 | 81.743147695487 | 2020 | 81.868314709738 | 2019 | 82.97863818506 | 2018 | 82.754574955444 | 2017 | 82.66950150389 | 2016 | 82.677011256872 | 2015 | 82.547308413822 | 2014 | 82.697277413712 | 2013 | 82.462630286375 | 2012 | 82.296342304787 | 2011 | 82.185982187042 | 2010 | 81.969352177364 | 2009 | 81.827322736637 | 2008 | 81.587356548729 | 2007 | 81.473065959085 | 2006 | 81.282990608775 | 2005 | 81.01382859444 | 2004 | 80.925498035126 | 2003 | 80.552318326363 | 2002 | 80.466354837618 | 2001 | 80.329999666175 | 2000 | 80.084355795838 | 1999 | 79.812052605752 | 1998 | 79.763868997574 | 1997 | 79.608284676282 | 1996 | 79.328788473196 | 1995 | 79.04379140032 | 1994 | 78.987551593224 | 1993 | 78.693728150613 | 1992 | 78.640058251933 | 1991 | 78.375386374348 | 1990 | 78.18364345449 | 1989 | 77.978373011345 | 1988 | 77.718707889833 | 1987 | 77.570215621048 | 1986 | 77.27266943497 | 1985 | 76.968813897056 | 1984 | 76.902027272752 | 1983 | 76.577802672854 | 1982 | 76.451666640639 | 1981 | 76.115391046112 | 1980 | 75.744101184481 | 1979 | 75.712803941852 | 1978 | 75.325729212475 | 1977 | 75.118179536685 | 1976 | 74.650763793475 | 1975 | 74.357351453849 | 1974 | 73.98951506438 | 1973 | 73.592651844268 | 1972 | 73.380289374362 | 1971 | 73.095013510145 | 1970 | 72.753242561433 | 1969 | 72.487349498135 | 1968 | 72.337894769831 | 1967 | 72.3310643373 | 1966 | 71.973833263195 | 1965 | 71.661839998042 | 1964 | 71.507868442085 | 1963 | 70.985717761748 | 1962 | 70.692417252326 | 1961 | 70.63204657673 | 1960 | 70.193971600585 |
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