Year % of total population 1960 49.5612632732639 1961 49.5088696361782 1962 49.4506203073279 1963 49.3957588587131 1964 49.3425933163161 1965 49.264735708343 1966 49.1475409536963 1967 49.021046994981 1968 48.9308389394858 1969 48.8930820138382 1970 48.8997852226001 1971 48.9233734531906 1972 48.9345433863518 1973 48.9265627025001 1974 48.9070450072413 1975 48.8839263094343 1976 48.8600493509585 1977 48.8347248705488 1978 48.8073199186767 1979 48.7868548895356 1980 48.7761500494277 1981 48.7753255417471 1982 48.7825347647619 1983 48.7964796938811 1984 48.8152506454114 1985 48.8363072805494 1986 48.8593820232404 1987 48.8799872762156 1988 48.9008601150696 1989 48.9273059465583 1990 48.955829155295 1991 48.9862610971404 1992 49.0178633602207 1993 49.0432924248135 1994 49.0653448906745 1995 49.0886976085377 1996 49.1116696838868 1997 49.1348496812931 1998 49.1628423335285 1999 49.1981077361977 2000 49.2307581008364 2001 49.248569098173 2002 49.2489512372613 2003 49.2457083721875 2004 49.2513518170066 2005 49.2595939795313 2006 49.2647872483373 2007 49.2651732432984 2008 49.262446339064 2009 49.258591808258 2010 49.2549214915752 2011 49.2771611702902 2012 49.3227883928518 2013 49.3658749284219 2014 49.4058809896213 2015 49.4422518085334 2016 49.4774689143399 2017 49.5107209202903 2018 49.5388395467662 2019 49.5629914639393 2020 49.5634381866801 2021 49.537928196194 2022 49.513201337278 2023 49.4991277308883