Year | Value | 2021 | 38.52217428372 | 2020 | 38.52461431835 | 2019 | 38.525831000114 | 2018 | 38.529751969702 | 2017 | 38.521494353387 | 2016 | 38.485422098361 | 2015 | 38.411367548334 | 2014 | 38.485753353455 | 2013 | 38.39610312267 | 2012 | 38.56808302658 | 2011 | 38.586446260154 | 2010 | 38.550949574038 | 2009 | 38.568465621181 | 2008 | 38.507637275459 | 2007 | 38.44014836351 | 2006 | 38.446038219747 | 2005 | 38.458463792888 | 2004 | 38.387108383923 | 2003 | 38.354156811834 | 2002 | 38.311008920288 | 2001 | 38.378569118239 | 2000 | 38.460894921494 | 1999 | 38.406009566686 | 1998 | 38.391344512133 | 1997 | 38.405408243478 | 1996 | 38.398668371241 | 1995 | 38.364636152403 | 1994 | 38.354528077683 | 1993 | 38.276835271329 | 1992 | 38.207597576074 | 1991 | 38.34666334576 | 1990 | 38.356725895107 | 1989 | 38.346541332685 | 1988 | 38.368725528059 | 1987 | 38.370742273093 | 1986 | 38.345936309175 | 1985 | 38.341701144604 | 1984 | 38.332222442944 | 1983 | 38.319617786481 | 1982 | 38.314071737638 | 1981 | 38.29435805493 | 1980 | 38.275501488862 | 1979 | 38.308273595665 | 1978 | 38.330861140046 | 1977 | 38.315130528781 | 1976 | 38.325617602957 | 1975 | 38.289517866848 | 1974 | 38.416925734372 | 1973 | 38.465428452441 | 1972 | 38.452722958726 | 1971 | 38.439614116005 | 1970 | 38.466840173964 | 1969 | 38.533392760087 | 1968 | 38.555576955461 | 1967 | 38.569189984441 | 1966 | 38.548014161584 | 1965 | 38.535409505121 | 1964 | 38.523309034917 | 1963 | 38.510704378454 | 1962 | 38.504149957094 | 1961 | 38.494570418182 |
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