Year | Value | 2022 | 49.064159809676 | 2021 | 49.060662394623 | 2020 | 49.051195611144 | 2019 | 49.039112488957 | 2018 | 49.031218794477 | 2017 | 49.011946016025 | 2016 | 48.963672043244 | 2015 | 48.907375061868 | 2014 | 48.860922571262 | 2013 | 48.812645754859 | 2012 | 48.766394565807 | 2011 | 48.726152621622 | 2010 | 48.697043819066 | 2009 | 48.685758040635 | 2008 | 48.688281025019 | 2007 | 48.687247342205 | 2006 | 48.681292258066 | 2005 | 48.679380067818 | 2004 | 48.676505227803 | 2003 | 48.675158914322 | 2002 | 48.681023202741 | 2001 | 48.692943789915 | 2000 | 48.714942534558 | 1999 | 48.746551844564 | 1998 | 48.779778286547 | 1997 | 48.813211018414 | 1996 | 48.820710376713 | 1995 | 48.799749660625 | 1994 | 48.777495791723 | 1993 | 48.754675229656 | 1992 | 48.735724075499 | 1991 | 48.719163346834 | 1990 | 48.702138293507 | 1989 | 48.684854767916 | 1988 | 48.668510953191 | 1987 | 48.698108793561 | 1986 | 48.770364088606 | 1985 | 48.843014605998 | 1984 | 48.918967573654 | 1983 | 48.953238784648 | 1982 | 48.944376354991 | 1981 | 48.93553831331 | 1980 | 48.922665591457 | 1979 | 48.957524925763 | 1978 | 49.057259163097 | 1977 | 49.171072723457 | 1976 | 49.265101739558 | 1975 | 49.3394603231 | 1974 | 49.416745948442 | 1973 | 49.497526652658 | 1972 | 49.576376729076 | 1971 | 49.625125682921 | 1970 | 49.632201715806 | 1969 | 49.608490215906 | 1968 | 49.564913523428 | 1967 | 49.513981284491 | 1966 | 49.453778283335 | 1965 | 49.386150256893 | 1964 | 49.308419383405 | 1963 | 49.209209067594 | 1962 | 49.09501986863 | 1961 | 48.971459573451 | 1960 | 48.90413390539 |
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