Year % of total population 1960 51.2235012920099 1961 51.4556794680363 1962 51.5435888820951 1963 51.4987809329175 1964 51.4528881113004 1965 51.406780143569 1966 51.3611443706065 1967 51.3157716364632 1968 51.2708674265687 1969 51.2265217064849 1970 51.1818226760003 1971 51.1380114223634 1972 51.0965614347553 1973 51.0569838232537 1974 51.0182708180761 1975 50.9807004255675 1976 50.9467324942735 1977 50.915481622327 1978 50.8842260452931 1979 50.8535640187268 1980 50.8196877166621 1981 50.7832214752938 1982 50.7542290880079 1983 50.7268410782246 1984 50.6944998038611 1985 50.6601420159045 1986 50.6252229866726 1987 50.5931096746616 1988 50.5647203657617 1989 50.5387032561888 1990 50.5148584666314 1991 50.4938689741197 1992 50.475627697961 1993 50.4580406803263 1994 50.4416266592326 1995 50.4280881861285 1996 50.4162847236648 1997 50.4055933281406 1998 50.3954668936238 1999 50.3862956956244 2000 50.377097343064 2001 50.3666144224199 2002 50.3542125368221 2003 50.3400262413749 2004 50.3263797467692 2005 50.3124918416148 2006 50.2982114075602 2007 50.2846010375049 2008 50.2714559307701 2009 50.2585242074832 2010 50.2459850661303 2011 50.2336974756506 2012 50.2209085630726 2013 50.2078043346115 2014 50.1954274036938 2015 50.184555048559 2016 50.1724596748515 2017 50.1588702186894 2018 50.148103340517 2019 50.1383951131513 2020 50.1318047085044 2021 50.1289881239598 2022 50.1244727836422 2023 50.1185085795017