Year % of total population 1960 47.8410450968081 1961 47.8231948939604 1962 47.8031903431578 1963 47.7840637237303 1964 47.7627679253787 1965 47.7405784769952 1966 47.7089393681292 1967 47.6646168677267 1968 47.6134406647012 1969 47.5511769813271 1970 47.4783071735775 1971 47.4839374524669 1972 47.5707060106647 1973 47.6567879293946 1974 47.7339813205489 1975 47.8078683135585 1976 47.880801281773 1977 47.9505596629325 1978 48.0182141736673 1979 48.0783751857544 1980 48.1270589658805 1981 48.1550210454722 1982 48.1652138478724 1983 48.1761286732736 1984 48.1873204917302 1985 48.1926790075639 1986 48.194551409795 1987 48.1948918599753 1988 48.1892708097425 1989 48.1785752244316 1990 48.1678858710391 1991 48.1532561985457 1992 48.1352061942866 1993 48.1240335492939 1994 48.1261723775277 1995 48.1385296631821 1996 48.1528344821809 1997 48.1665998555458 1998 48.1810496968637 1999 48.1997766327003 2000 48.2264573046337 2001 48.2493668661206 2002 48.2247097425978 2003 48.1727994420884 2004 48.1312613543065 2005 48.0939323777726 2006 48.0582556039024 2007 48.0183759465077 2008 47.961347552585 2009 47.8913014147498 2010 47.8261354098697 2011 47.7530628521473 2012 47.6718684869141 2013 47.5880008046225 2014 47.4988691795412 2015 47.423142395857 2016 47.3736476619542 2017 47.3254698264279 2018 47.2557820412086 2019 47.2085165263141 2020 47.1915167244891 2021 47.1786628374857 2022 47.1836403263016 2023 47.1989991807842