Year % of total population 1960 48.0830541981841 1961 48.1650007849704 1962 48.2423717926776 1963 48.3158930992365 1964 48.3852731127333 1965 48.4502851864169 1966 48.5118030016313 1967 48.5704638247837 1968 48.6260048517825 1969 48.6779966132701 1970 48.7267007415904 1971 48.7728462706079 1972 48.8163513456882 1973 48.8566305596267 1974 48.893531265146 1975 48.9271953691361 1976 48.9580304391044 1977 48.9858244870205 1978 49.0216063823851 1979 49.0787455677565 1980 49.1474121402322 1981 49.2161723752924 1982 49.3043765895287 1983 49.4033682934013 1984 49.5388085890177 1985 49.7105131256278 1986 49.8377939983779 1987 49.9154392653591 1988 49.9646553268371 1989 49.9814956533993 1990 49.9907525117824 1991 49.9965054056396 1992 50.0018453347408 1993 49.9874248059093 1994 49.9632397542502 1995 49.9390276286273 1996 49.9071907647314 1997 49.8737886983953 1998 49.8433202120657 1999 49.8111000933559 2000 49.7751110859131 2001 49.7402054139668 2002 49.704417889001 2003 49.6691650699289 2004 49.6350847479431 2005 49.6046505883306 2006 49.5795494420771 2007 49.5509819385568 2008 49.5254604924268 2009 49.5058572832505 2010 49.4837080757804 2011 49.4676649997126 2012 49.4555770622526 2013 49.4421028692971 2014 49.4321347124254 2015 49.4231842452837 2016 49.4146082450656 2017 49.4192840877382 2018 49.4372087779621 2019 49.4554852316151 2020 49.4709437976734 2021 49.4884046075232 2022 49.5087222518757 2023 49.5270627592605