Year % of total population 1960 42.30867038111939 1961 42.49009754442176 1962 42.678841988437355 1963 42.89027127196731 1964 43.11946057628474 1965 43.323827026733795 1966 43.49486267181048 1967 43.64747573212136 1968 43.78019650552332 1969 43.900013541485194 1970 44.012320230761965 1971 44.14137747098267 1972 44.26914397694694 1973 44.35602698668691 1974 44.40913222073547 1975 44.434261048729354 1976 44.44380062405142 1977 44.446283499035225 1978 44.44898650094452 1979 44.45411931185536 1980 44.447670984284 1981 44.43946868406706 1982 44.44658000518859 1983 44.46934526705412 1984 44.50688676264351 1985 44.53036050306996 1986 44.52548421082286 1987 44.50294806445151 1988 44.46224275160665 1989 44.41702378151821 1990 44.365195156758055 1991 44.28754863939915 1992 44.213987447640285 1993 44.13368502645743 1994 43.98741387454865 1995 43.807696622657346 1996 43.63899228558187 1997 43.45577654788642 1998 43.2264290061589 1999 42.98148631764281 2000 42.73627507462684 2001 42.49756420161683 2002 42.298759204135045 2003 42.11603448652804 2004 41.92076542914632 2005 41.72266220646208 2006 41.52937375510021 2007 41.35149741276438 2008 41.19448545489435 2009 41.03250592749349 2010 40.85337740985105 2011 40.67252842522325 2012 40.51503585854676 2013 40.38216080655378 2014 40.23665249618538 2015 40.06633941131848 2016 39.865560436903 2017 39.63033008923099 2018 39.37385509451852 2019 39.10783853457397 2020 38.833404124380635 2021 38.557946690268295 2022 38.277263120679784 2023 37.978197350982384