Year % of total population 1960 51.29347612577239 1961 51.26215318340811 1962 51.23858782111197 1963 51.21981971486037 1964 51.19966557198183 1965 51.17951520104589 1966 51.16071840538506 1967 51.13777139358867 1968 51.11085690740752 1969 51.086245876013564 1970 51.0650806780858 1971 51.03742019752269 1972 51.011718265743724 1973 50.99720382376509 1974 50.9837745249483 1975 50.96904099795607 1976 50.951423782176484 1977 50.926106882636155 1978 50.886500269864854 1979 50.84671591382934 1980 50.85324210848676 1981 50.86476312292157 1982 50.84788990813249 1983 50.829724148666514 1984 50.812210293686775 1985 50.79831405580418 1986 50.78555811657874 1987 50.76994839538233 1988 50.751793502185976 1989 50.74094795858779 1990 50.734812510169064 1991 50.7265531851023 1992 50.71626654172254 1993 50.707713595135715 1994 50.70407552494523 1995 50.700905091591025 1996 50.695425603800594 1997 50.6886716744201 1998 50.682839480916655 1999 50.67827281382301 2000 50.67290277649959 2001 50.669829061004556 2002 50.669600390083865 2003 50.66857739231678 2004 50.66514375081675 2005 50.65989434421779 2006 50.65409834520189 2007 50.647048528902225 2008 50.63856519371361 2009 50.62990375617782 2010 50.619867959158384 2011 50.60873612715249 2012 50.59873301024997 2013 50.58957188298021 2014 50.58024076470722 2015 50.5396289998052 2016 50.46942326142731 2017 50.410447337272345 2018 50.36637642311955 2019 50.330599536022255 2020 50.30465193065207 2021 50.28667772356723 2022 50.275963276675284 2023 50.271763252602945