Year | Value | 2022 | 49.317190395041 | 2021 | 49.305191201947 | 2020 | 49.290604429247 | 2019 | 49.276585960568 | 2018 | 49.262150549828 | 2017 | 49.248519072809 | 2016 | 49.233986415229 | 2015 | 49.217359530063 | 2014 | 49.204772253253 | 2013 | 49.19666804206 | 2012 | 49.186932859193 | 2011 | 49.176569127201 | 2010 | 49.166168861801 | 2009 | 49.153812906117 | 2008 | 49.138747769007 | 2007 | 49.124934627185 | 2006 | 49.113840083276 | 2005 | 49.105289008656 | 2004 | 49.100021127691 | 2003 | 49.097196007661 | 2002 | 49.095649553993 | 2001 | 49.094466371348 | 2000 | 49.094911502378 | 1999 | 49.096346984492 | 1998 | 49.097997675734 | 1997 | 49.10141198558 | 1996 | 49.105846627918 | 1995 | 49.109843268131 | 1994 | 49.1147696406 | 1993 | 49.120292226236 | 1992 | 49.123334871257 | 1991 | 49.1235063566 | 1990 | 49.122047667353 | 1989 | 49.119505946745 | 1988 | 49.11360504144 | 1987 | 49.106235684253 | 1986 | 49.099678284427 | 1985 | 49.093615241086 | 1984 | 49.088049743565 | 1983 | 49.082161470396 | 1982 | 49.076057623219 | 1981 | 49.075950772157 | 1980 | 49.081035359033 | 1979 | 49.076724936538 | 1978 | 49.065983509252 | 1977 | 49.060109815873 | 1976 | 49.056853048413 | 1975 | 49.053850561418 | 1974 | 49.057700710168 | 1973 | 49.068612272837 | 1972 | 49.079889707149 | 1971 | 49.077729709653 | 1970 | 49.072037946271 | 1969 | 49.076293288477 | 1968 | 49.080334044729 | 1967 | 49.084647395163 | 1966 | 49.08982858818 | 1965 | 49.097694327378 | 1964 | 49.10778817104 | 1963 | 49.118403741628 | 1962 | 49.129160084246 | 1961 | 49.139007707127 | 1960 | 49.148193756449 |
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