Year % of total population 1960 55.5397840942487 1961 55.4870229598163 1962 55.4317786177159 1963 55.3356554098572 1964 55.181682160916 1965 54.9466202662646 1966 54.6583323341661 1967 54.3749968781312 1968 54.0996271436168 1969 53.8326614172133 1970 53.5777064042251 1971 53.3352829471189 1972 53.1029186650456 1973 52.8797665754711 1974 52.6614615305456 1975 52.4502471172668 1976 52.2475914502444 1977 52.0508163221312 1978 51.8606291704545 1979 51.6775551349265 1980 51.5025969974368 1981 51.3369869374762 1982 51.1852084721804 1983 51.0646640504312 1984 50.9568991593017 1985 50.8505457195703 1986 50.7414622553995 1987 50.6349804964913 1988 50.5264791565855 1989 50.4132114095266 1990 50.2789300515877 1991 50.1109894336682 1992 49.9245652038871 1993 49.7334037429947 1994 49.5078193409366 1995 49.2541771342705 1996 48.985053747252 1997 48.7118959386792 1998 48.4451497993958 1999 48.1991642201393 2000 47.9969344494884 2001 47.8492043568795 2002 47.7675451249846 2003 47.7446563565764 2004 47.7813164516322 2005 48.0851067054677 2006 48.4669443127336 2007 47.9988968973278 2008 47.7919226324364 2009 48.3451993372724 2010 48.6775706365083 2011 49.3617576739049 2012 50.1755248805667 2013 50.729094606505 2014 51.3593001756622 2015 51.8020783563802 2016 52.0800436941602 2017 52.4815668980114 2018 52.8844624265785 2019 53.290894238376 2020 53.7751348360726 2021 54.1713988581692 2022 54.4750267397973 2023 54.7597430142633