Year | Value | 2021 | 60.240637832665 | 2020 | 60.847492791602 | 2019 | 61.243176070097 | 2018 | 60.861966429526 | 2017 | 60.475893074858 | 2016 | 60.067723331477 | 2015 | 59.561617180458 | 2014 | 59.141346892951 | 2013 | 58.666681867562 | 2012 | 58.139480025035 | 2011 | 57.557144064125 | 2010 | 56.845697229073 | 2009 | 56.21789288383 | 2008 | 55.448862608217 | 2007 | 54.847107811126 | 2006 | 54.211368239601 | 2005 | 53.46017793171 | 2004 | 52.84661812154 | 2003 | 52.367395929974 | 2002 | 51.889071148462 | 2001 | 51.533762631328 | 2000 | 51.261944101646 | 1999 | 50.638129068405 | 1998 | 49.925086744593 | 1997 | 50.212722398148 | 1996 | 50.045811607797 | 1995 | 50.111315440101 | 1994 | 49.99948043792 | 1993 | 49.69437855183 | 1992 | 49.469336733924 | 1991 | 49.696841781069 | 1990 | 49.821847519093 | 1989 | 49.88237979287 | 1988 | 49.0174285673 | 1987 | 49.335397307313 | 1986 | 49.004275798654 | 1985 | 48.609681585988 | 1984 | 48.358663599392 | 1983 | 48.328804574878 | 1982 | 49.172894287908 | 1981 | 48.934419275782 | 1980 | 48.569034180993 | 1979 | 48.2100289146 | 1978 | 47.748586960162 | 1977 | 47.447803211481 | 1976 | 46.984952204866 | 1975 | 46.306432704088 | 1974 | 45.920461663804 | 1973 | 45.708795356985 | 1972 | 44.987343657165 | 1971 | 44.870803968841 | 1970 | 44.369830237344 | 1969 | 43.911307167478 | 1968 | 43.670734775988 | 1967 | 43.232178331786 | 1966 | 42.984090052141 | 1965 | 43.029451291312 | 1964 | 42.890837726942 | 1963 | 42.440620261289 | 1962 | 42.200720575525 | 1961 | 41.739739358076 | 1960 | 41.422545776448 |
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