Year % of total population 1960 50.5607673829108 1961 50.54648460665741 1962 50.535473944955 1963 50.5266306957967 1964 50.517516980174946 1965 50.50870661250595 1966 50.50052256042787 1967 50.49134049733329 1968 50.481676054842154 1969 50.473389679567454 1970 50.467194975416795 1971 50.42955496505897 1972 50.3925462854447 1973 50.388343167753305 1974 50.38660228497102 1975 50.37585584549233 1976 50.35869201266332 1977 50.34508930707785 1978 50.32655491229401 1979 50.3068629286996 1980 50.30489073312069 1981 50.30698438998006 1982 50.29988823869146 1983 50.29237944297369 1984 50.283666782662884 1985 50.27698502369066 1986 50.272429689975965 1987 50.267283116474225 1988 50.258258870732135 1989 50.25275595431842 1990 50.254593993489394 1991 50.25753390470033 1992 50.258661179710536 1993 50.25871332935814 1994 50.2577506144405 1995 50.252291706719056 1996 50.242468183091184 1997 50.2318926956722 1998 50.220709743183264 1999 50.209227135659106 2000 50.2014616008236 2001 50.19457677175276 2002 50.18643584197472 2003 50.17737564938615 2004 50.16711428355352 2005 50.15484372912831 2006 50.13880694110049 2007 50.12199021731248 2008 50.10379073157899 2009 50.085574167982315 2010 50.07255200434002 2011 50.062036053404725 2012 50.05180500229056 2013 50.041656956607774 2014 50.03211907838288 2015 50.01465906694724 2016 49.99069915289143 2017 49.97168445664455 2018 49.955721136074594 2019 49.94078335144118 2020 49.931892617683026 2021 49.92780248503551 2022 49.922608775821985 2023 49.9176648819441