Year | Value | 2021 | 33.366724863333 | 2020 | 33.38389765019 | 2019 | 33.527004207333 | 2018 | 33.5766214437 | 2017 | 33.694936600166 | 2016 | 33.670139683994 | 2015 | 33.956314854096 | 2014 | 34.018343364861 | 2013 | 34.04035771612 | 2012 | 33.953061341596 | 2011 | 34.068739958687 | 2010 | 33.984565510514 | 2009 | 34.264651042713 | 2008 | 34.225396552219 | 2007 | 34.063727880231 | 2006 | 34.027299839413 | 2005 | 34.132354627824 | 2004 | 34.114172663933 | 2003 | 33.906711390155 | 2002 | 33.798658487645 | 2001 | 33.857838922327 | 2000 | 33.827195873334 | 1999 | 33.875866811852 | 1998 | 34.035298836743 | 1997 | 33.897722389342 | 1996 | 33.902432037583 | 1995 | 33.901460899456 | 1994 | 33.814557016413 | 1993 | 33.444087992667 | 1992 | 32.844499183685 | 1991 | 33.10801134248 | 1990 | 34.288087531865 | 1989 | 34.225073754762 | 1988 | 34.222209492166 | 1987 | 34.213616704379 | 1986 | 34.256580643313 | 1985 | 34.247987855527 | 1984 | 34.233666542549 | 1983 | 34.276630481482 | 1982 | 34.299544582247 | 1981 | 34.38260819752 | 1980 | 34.457079025005 | 1979 | 34.534414115086 | 1978 | 34.617477730358 | 1977 | 34.574513791424 | 1976 | 34.620341992954 | 1975 | 34.488585913557 | 1974 | 34.428436399049 | 1973 | 34.342508521181 | 1972 | 34.38260819752 | 1971 | 34.270901956291 | 1970 | 34.233666542549 | 1969 | 34.374015409733 | 1968 | 34.462807550196 | 1967 | 34.511500014321 | 1966 | 34.815111849454 | 1965 | 34.809383324263 | 1964 | 34.832297425028 | 1963 | 34.84375447541 | 1962 | 34.901039727322 | 1961 | 35.001288918168 |
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