Year | Value | 2022 | 50.176781694178 | 2021 | 50.20946002891 | 2020 | 50.251371314615 | 2019 | 50.289187109362 | 2018 | 50.317945301537 | 2017 | 50.345666916246 | 2016 | 50.373732188709 | 2015 | 50.403216196456 | 2014 | 50.434681969614 | 2013 | 50.467995090307 | 2012 | 50.502727477006 | 2011 | 50.538246320556 | 2010 | 50.573679475396 | 2009 | 50.607743877241 | 2008 | 50.639024806184 | 2007 | 50.666641424364 | 2006 | 50.690336495419 | 2005 | 50.7105689964 | 2004 | 50.728625175783 | 2003 | 50.746267987406 | 2002 | 50.766000299485 | 2001 | 50.725605141977 | 2000 | 50.621072451018 | 1999 | 50.513578399914 | 1998 | 50.401587708277 | 1997 | 50.28402189133 | 1996 | 50.160527907418 | 1995 | 50.031481292996 | 1994 | 49.894639182572 | 1993 | 49.823100988718 | 1992 | 49.824324724599 | 1991 | 49.82677516301 | 1990 | 49.830004303547 | 1989 | 49.833174141154 | 1988 | 49.835555171214 | 1987 | 49.836867521725 | 1986 | 49.836924473535 | 1985 | 49.836236665598 | 1984 | 49.835357708182 | 1983 | 49.834648644841 | 1982 | 49.834787453123 | 1981 | 49.835911646144 | 1980 | 49.838163244032 | 1979 | 49.842210903072 | 1978 | 49.848920278129 | 1977 | 49.8579516331 | 1976 | 49.868298353605 | 1975 | 49.879711024463 | 1974 | 49.892278564459 | 1973 | 49.905971388834 | 1972 | 49.920917304242 | 1971 | 49.937573929186 | 1970 | 49.955796313164 | 1969 | 49.973121700804 | 1968 | 49.989233910605 | 1967 | 50.006157341742 | 1966 | 50.024152953658 | 1965 | 50.067024890972 | 1964 | 50.112983645021 | 1963 | 50.136861288774 | 1962 | 50.16227588377 | 1961 | 50.190132363577 | 1960 | 50.219722676114 |
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