Year | Value | 2022 | 49.753842583422 | 2021 | 49.740938726838 | 2020 | 49.729428378843 | 2019 | 49.717025465117 | 2018 | 49.699662483292 | 2017 | 49.679864873832 | 2016 | 49.659115331136 | 2015 | 49.634930561134 | 2014 | 49.608568952576 | 2013 | 49.579197588181 | 2012 | 49.548377643238 | 2011 | 49.516567811624 | 2010 | 49.479913796441 | 2009 | 49.443885078635 | 2008 | 49.408033431802 | 2007 | 49.370864810868 | 2006 | 49.337226683434 | 2005 | 49.307563142629 | 2004 | 49.278667679759 | 2003 | 49.249644215477 | 2002 | 49.251522280244 | 2001 | 49.286727693891 | 2000 | 49.324783536307 | 1999 | 49.366379782585 | 1998 | 49.41132836205 | 1997 | 49.457100292938 | 1996 | 49.504014635634 | 1995 | 49.552914088821 | 1994 | 49.593907198217 | 1993 | 49.608194407473 | 1992 | 49.590472269933 | 1991 | 49.551007073138 | 1990 | 49.500872560099 | 1989 | 49.445851488199 | 1988 | 49.387773368428 | 1987 | 49.330565398944 | 1986 | 49.275236788229 | 1985 | 49.219237392489 | 1984 | 49.163552772921 | 1983 | 49.150350129405 | 1982 | 49.179457275548 | 1981 | 49.225007605883 | 1980 | 49.272042594763 | 1979 | 49.302098093231 | 1978 | 49.33117772752 | 1977 | 49.356376565726 | 1976 | 49.379642788189 | 1975 | 49.402766152887 | 1974 | 49.424444952463 | 1973 | 49.431676502369 | 1972 | 49.424407683127 | 1971 | 49.416608336686 | 1970 | 49.406219797969 | 1969 | 49.394377109752 | 1968 | 49.383853783725 | 1967 | 49.372954165052 | 1966 | 49.361000353999 | 1965 | 49.350196553558 | 1964 | 49.341248949874 | 1963 | 49.330566387131 | 1962 | 49.318036513462 | 1961 | 49.305381437728 | 1960 | 49.292504172411 |
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