Year % of total population 1960 50.7543413976707 1961 50.7964739636751 1962 50.817528901612 1963 50.8023407917384 1964 50.7686402327335 1965 50.7330338453102 1966 50.6949340316245 1967 50.65649075391 1968 50.6213927309057 1969 50.5913506779883 1970 50.5640784710552 1971 50.5331120639307 1972 50.5016181987645 1973 50.4801425520703 1974 50.4623947806647 1975 50.437356184678 1976 50.4070360355757 1977 50.3768461516546 1978 50.3521685829548 1979 50.3346687460241 1980 50.3227157765757 1981 50.3176405202272 1982 50.3179309391816 1983 50.3230460921844 1984 50.3361361976637 1985 50.3536371249277 1986 50.3715010567569 1987 50.3899472242584 1988 50.4072984882508 1989 50.421603010694 1990 50.4318117198177 1991 50.4106373595325 1992 50.3616652692288 1993 50.312816566836 1994 50.2623432979329 1995 50.2102642028535 1996 50.1563270228273 1997 50.1027226353739 1998 50.0513022228173 1999 50.002447293998 2000 49.9532045430247 2001 49.9158554182255 2002 49.8922990148885 2003 49.8685545019882 2004 49.8446072393992 2005 49.8189258279493 2006 49.7910682362838 2007 49.7591658638862 2008 49.7232073146641 2009 49.6866864395391 2010 49.6532458525866 2011 49.624485708688 2012 49.5998044609291 2013 49.5753824889149 2014 49.5489171612699 2015 49.5223689694878 2016 49.4951352913763 2017 49.4670362643957 2018 49.4401261096156 2019 49.4125107326432 2020 49.3802722702854 2021 49.3447223259413 2022 49.3086791604879 2023 49.2731191328023