Year % of total population 1960 50.1562104795513 1961 50.2990535591187 1962 50.3262034991125 1963 50.3650202050885 1964 50.4231915714573 1965 50.5116461335339 1966 50.6356094752347 1967 50.7863659615448 1968 50.9389842171445 1969 51.0470303384429 1970 51.0200009950744 1971 50.8997419317865 1972 50.7844086419363 1973 50.6744367405822 1974 50.5705260453004 1975 50.4683896527556 1976 50.3661594268713 1977 50.2678884622322 1978 50.1758327446507 1979 50.0902872457268 1980 50.0105341542491 1981 49.9369805120966 1982 49.8692321310737 1983 49.8001392088809 1984 49.7299874751786 1985 49.6659235166997 1986 49.60828734447 1987 49.5417408005213 1988 49.4701526482965 1989 49.4077012819968 1990 49.3499843346292 1991 49.3072480120726 1992 49.2713204116966 1993 49.2128326840908 1994 49.148668577572 1995 49.1284337626695 1996 49.1411945061477 1997 49.1536361757191 1998 49.1560281915686 1999 49.1428478535328 2000 49.1321247900612 2001 49.1247012455209 2002 49.1201171673735 2003 49.1311850107441 2004 49.1505170840853 2005 49.1708043803907 2006 49.1905155849966 2007 49.2093041673896 2008 49.2290121458513 2009 49.248554070936 2010 49.2662423277337 2011 49.2831827184434 2012 49.2988964873045 2013 49.3137415907185 2014 49.3283646542728 2015 49.3425080545985 2016 49.3579021405297 2017 49.374281413906 2018 49.3883885776513 2019 49.4011205186887 2020 49.4114420856511 2021 49.4192055628466 2022 49.4275574632119 2023 49.4369374588004