Year % of total population 1960 51.1839524341253 1961 51.1422766649619 1962 51.1013279836393 1963 51.0630721042683 1964 51.0255513404602 1965 50.9878278076233 1966 50.9512845591675 1967 50.91618815578 1968 50.8827424018331 1969 50.8512737704621 1970 50.8221194195568 1971 50.8086068363161 1972 50.8095011510707 1973 50.8110412603932 1974 50.8127551960804 1975 50.8143789798624 1976 50.8161350512069 1977 50.8176027283819 1978 50.8182745586684 1979 50.8180344155444 1980 50.8175209017498 1981 50.7995585141381 1982 50.7655360235684 1983 50.7341462459504 1984 50.7050839502981 1985 50.6783791655648 1986 50.6543708746439 1987 50.6337229626287 1988 50.6166506465487 1989 50.601732447614 1990 50.5872295015941 1991 50.5717759467872 1992 50.5549369291641 1993 50.5373706730435 1994 50.5039263054335 1995 50.4552013539674 1996 50.4066895368626 1997 50.3570380016455 1998 50.3052631750669 1999 50.2518406799436 2000 50.1976131191376 2001 50.1426548058928 2002 50.0920452377523 2003 50.0590532355967 2004 50.0386626844696 2005 50.0183263303217 2006 49.9984814348753 2007 49.9796493079301 2008 49.9617925920815 2009 49.9447983880438 2010 49.9288821661769 2011 49.9140432845874 2012 49.8975620927574 2013 49.8794911911139 2014 49.8614722557114 2015 49.8419297393785 2016 49.8188063987236 2017 49.7913050918699 2018 49.7619842934174 2019 49.7343173542598 2020 49.7032838148582 2021 49.6541692118917 2022 49.612907949927 2023 49.5931867660481