Year % of total population 1960 50.4881332445261 1961 50.4132214737014 1962 50.3454898793722 1963 50.2842502846669 1964 50.2306786429709 1965 50.1835170904261 1966 50.1402225326122 1967 50.1024732965731 1968 50.0713075483947 1969 50.0443574466137 1970 50.0210676065514 1971 50.0003809734568 1972 49.9804867107772 1973 49.9614843040761 1974 49.9401280980228 1975 49.9138746773252 1976 49.8799349503477 1977 49.8409656816818 1978 49.8018279545757 1979 49.7588408910305 1980 49.7103034549945 1981 49.6600899457522 1982 49.6132514085478 1983 49.567351152637 1984 49.5184573170328 1985 49.4688454606029 1986 49.4181340292708 1987 49.3662327772023 1988 49.3215366420044 1989 49.2866176307357 1990 49.2572118817785 1991 49.2324611982005 1992 49.2135766723124 1993 49.2038362569869 1994 49.2012594897548 1995 49.20344736576 1996 49.2134334575681 1997 49.2270361742578 1998 49.2420824655712 1999 49.2612887898876 2000 49.2809497792857 2001 49.2981223735497 2002 49.3160516010448 2003 49.3362866363399 2004 49.3570483624435 2005 49.3798893198875 2006 49.4038196583557 2007 49.4250937463635 2008 49.4432556715493 2009 49.4595124271098 2010 49.4867601517102 2011 49.5259559001248 2012 49.5651272519114 2013 49.6043965089257 2014 49.6430372619199 2015 49.6792868133957 2016 49.7167486884743 2017 49.7520536433041 2018 49.7811560668897 2019 49.809715913916 2020 49.8345130664737 2021 49.8553099479453 2022 49.8776596374388 2023 49.9023491147221