Year | Value | 2022 | 50.077264619933 | 2021 | 50.072090053944 | 2020 | 50.067994675448 | 2019 | 50.059060349834 | 2018 | 50.044041451087 | 2017 | 50.027989229915 | 2016 | 50.00887577542 | 2015 | 49.984801253641 | 2014 | 49.967224011865 | 2013 | 49.957563634715 | 2012 | 49.9472808185 | 2011 | 49.936902262087 | 2010 | 49.926226338718 | 2009 | 49.913038363182 | 2008 | 49.894660890346 | 2007 | 49.876377233499 | 2006 | 49.859551899394 | 2005 | 49.843508005748 | 2004 | 49.831227740965 | 2003 | 49.820967014569 | 2002 | 49.811918306453 | 2001 | 49.803778975799 | 2000 | 49.796873217743 | 1999 | 49.789100236571 | 1998 | 49.777593949882 | 1997 | 49.766479848355 | 1996 | 49.755970130664 | 1995 | 49.746103711992 | 1994 | 49.740601231601 | 1993 | 49.739590761682 | 1992 | 49.739598588169 | 1991 | 49.740671599071 | 1990 | 49.743569331678 | 1989 | 49.745376108634 | 1988 | 49.739834906949 | 1987 | 49.730764821311 | 1986 | 49.725550952852 | 1985 | 49.720906984081 | 1984 | 49.714153569616 | 1983 | 49.705398175279 | 1982 | 49.697847471599 | 1981 | 49.690748694408 | 1980 | 49.692845166725 | 1979 | 49.690814102473 | 1978 | 49.671041139163 | 1977 | 49.65243073023 | 1976 | 49.638798347753 | 1975 | 49.621645917795 | 1974 | 49.610924646772 | 1973 | 49.609227398884 | 1972 | 49.605071047875 | 1971 | 49.568088348169 | 1970 | 49.530478693528 | 1969 | 49.524351597796 | 1968 | 49.516139328078 | 1967 | 49.50653359782 | 1966 | 49.497363741352 | 1965 | 49.489161518613 | 1964 | 49.480339917857 | 1963 | 49.471230477936 | 1962 | 49.462399592881 | 1961 | 49.451402639622 | 1960 | 49.437115052236 |
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