Year | Value | 2022 | 49.460274259472 | 2021 | 49.439855553327 | 2020 | 49.418134901895 | 2019 | 49.400585751886 | 2018 | 49.386418226258 | 2017 | 49.372926826215 | 2016 | 49.36255964382 | 2015 | 49.356146983054 | 2014 | 49.352445451084 | 2013 | 49.350607748771 | 2012 | 49.350644789134 | 2011 | 49.352003274124 | 2010 | 49.351848624697 | 2009 | 49.3504901062 | 2008 | 49.351123099838 | 2007 | 49.353111241946 | 2006 | 49.355599026328 | 2005 | 49.35815467197 | 2004 | 49.360208022328 | 2003 | 49.361715731501 | 2002 | 49.36332045252 | 2001 | 49.365630406995 | 2000 | 49.371514120835 | 1999 | 49.379443616197 | 1998 | 49.38427424296 | 1997 | 49.389249732031 | 1996 | 49.39640207803 | 1995 | 49.404336029285 | 1994 | 49.412864672439 | 1993 | 49.421523107861 | 1992 | 49.431363299146 | 1991 | 49.443195487073 | 1990 | 49.455880417226 | 1989 | 49.468939117508 | 1988 | 49.48014077124 | 1987 | 49.489546754046 | 1986 | 49.497507719252 | 1985 | 49.502556762543 | 1984 | 49.504707280056 | 1983 | 49.50443610825 | 1982 | 49.503831402708 | 1981 | 49.503120284782 | 1980 | 49.500387255966 | 1979 | 49.493126008467 | 1978 | 49.484572340533 | 1977 | 49.478269271422 | 1976 | 49.471894935951 | 1975 | 49.464630249082 | 1974 | 49.461777045409 | 1973 | 49.465751567944 | 1972 | 49.471484357523 | 1971 | 49.478141769685 | 1970 | 49.482925066236 | 1969 | 49.484656732013 | 1968 | 49.483391169236 | 1967 | 49.479709178468 | 1966 | 49.473117862638 | 1965 | 49.46189697907 | 1964 | 49.449442651979 | 1963 | 49.441053375332 | 1962 | 49.431548758082 | 1961 | 49.412513699859 | 1960 | 49.383130903368 |
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