Year % of total population 1960 50.29905124635807 1961 50.30612188725729 1962 50.31152142081938 1963 50.314522767483076 1964 50.31797245657649 1965 50.32099291466287 1966 50.32292195637612 1967 50.32564271327219 1968 50.32895481964479 1969 50.33127607511141 1970 50.33414448152706 1971 50.32796736896318 1972 50.313114044381024 1973 50.296588413782835 1974 50.276668007603476 1975 50.25730812569674 1976 50.24393799892435 1977 50.23409341978615 1978 50.22982875970457 1979 50.226554977174644 1980 50.197503126733515 1981 50.18857657368398 1982 50.222921784323006 1983 50.27254171971879 1984 50.33256000094293 1985 50.39921194266095 1986 50.43001672322869 1987 50.42038732520017 1988 50.41841225803989 1989 50.41550512656442 1990 50.4076172373994 1991 50.40022291485697 1992 50.409560322840086 1993 50.43436151924952 1994 50.45505205405187 1995 50.47539165917554 1996 50.49880268557883 1997 50.50665663027091 1998 50.499871055990184 1999 50.49388401489398 2000 50.482391414585734 2001 50.46774378127423 2002 50.4517507052703 2003 50.432814866627936 2004 50.41367258633473 2005 50.39602165104184 2006 50.37785152087185 2007 50.3588467048825 2008 50.34145423539323 2009 50.32671741984976 2010 50.31228665412209 2011 50.29765216763343 2012 50.28381318628714 2013 50.26977942918709 2014 50.25464485855966 2015 50.23400160454082 2016 50.22099371740905 2017 50.21371871501257 2018 50.20239439875697 2019 50.192706886620954 2020 50.18382815475975 2021 50.176715161886364 2022 50.170187741120905 2023 50.16285430300397