Year | Value | 2022 | 49.631011603759 | 2021 | 49.632846024539 | 2020 | 49.636272775859 | 2019 | 49.635817355354 | 2018 | 49.628772100559 | 2017 | 49.619407099418 | 2016 | 49.612890022102 | 2015 | 49.613242750862 | 2014 | 49.615510913373 | 2013 | 49.61848780049 | 2012 | 49.621137310601 | 2011 | 49.621619216921 | 2010 | 49.623045228574 | 2009 | 49.626193613227 | 2008 | 49.629126183525 | 2007 | 49.631567033461 | 2006 | 49.63265343604 | 2005 | 49.636838512718 | 2004 | 49.645816453849 | 2003 | 49.654949154782 | 2002 | 49.664408661005 | 2001 | 49.675224997098 | 2000 | 49.685740413876 | 1999 | 49.69447978804 | 1998 | 49.700668318492 | 1997 | 49.707443753714 | 1996 | 49.715702176931 | 1995 | 49.723294967897 | 1994 | 49.729168370198 | 1993 | 49.732054824035 | 1992 | 49.732443002788 | 1991 | 49.734267466798 | 1990 | 49.739561239757 | 1989 | 49.745171217171 | 1988 | 49.747805241041 | 1987 | 49.745531741906 | 1986 | 49.745487275483 | 1985 | 49.753691184349 | 1984 | 49.771019475363 | 1983 | 49.793132608799 | 1982 | 49.810940724671 | 1981 | 49.823309986335 | 1980 | 49.834653143883 | 1979 | 49.84688611825 | 1978 | 49.860707927671 | 1977 | 49.875189849716 | 1976 | 49.887222140315 | 1975 | 49.899154389418 | 1974 | 49.910295707629 | 1973 | 49.926541365302 | 1972 | 49.953266215017 | 1971 | 49.977104232232 | 1970 | 49.993477916204 | 1969 | 50.011603824612 | 1968 | 50.032039186211 | 1967 | 50.054115965786 | 1966 | 50.079543540688 | 1965 | 50.104225310775 | 1964 | 50.13120611496 | 1963 | 50.166843692114 | 1962 | 50.203897658765 | 1961 | 50.236078876194 | 1960 | 50.266070731114 |
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