Year % of total population 1960 50.40100190658579 1961 50.406632794203354 1962 50.40688765265546 1963 50.40365727902824 1964 50.401467973319036 1965 50.399588154964256 1966 50.396891638614555 1967 50.39323789481671 1968 50.38875678102717 1969 50.38375819461862 1970 50.379081796454315 1971 50.373994381765435 1972 50.37063976519232 1973 50.3683807315529 1974 50.361932169208664 1975 50.353094449879244 1976 50.345797524747795 1977 50.34295752404127 1978 50.345150072737226 1979 50.34981001279133 1980 50.35647200003335 1981 50.365550725771165 1982 50.37512252495442 1983 50.3837621392706 1984 50.3925359176534 1985 50.39284229814278 1986 50.3853737705063 1987 50.375537330119805 1988 50.37268273360795 1989 50.37254501592596 1990 50.367328078473406 1991 50.358183268537644 1992 50.34715444603126 1993 50.33602082262524 1994 50.32680741649892 1995 50.323373234292895 1996 50.32621901428358 1997 50.328540840153174 1998 50.32830311178171 1999 50.330395607634436 2000 50.326623845831286 2001 50.31999354824196 2002 50.310706328383766 2003 50.29702495161584 2004 50.28395784374575 2005 50.27207183892891 2006 50.260097626421434 2007 50.248065295262144 2008 50.23790009587384 2009 50.23121279342637 2010 50.22407042837598 2011 50.215723378377476 2012 50.2084194782688 2013 50.20079124339242 2014 50.19308113005167 2015 50.18344248875453 2016 50.17244832739405 2017 50.16297117752061 2018 50.156744648877805 2019 50.15358817613572 2020 50.15132030370138 2021 50.15052073940384 2022 50.15124467343985 2023 50.15099921813483