Year % of total population 1960 52.3615562571747 1961 52.2718186151231 1962 52.1826998938033 1963 52.096978031767 1964 52.0127389626004 1965 51.9296977202274 1966 51.8509367642028 1967 51.7752508229482 1968 51.7028710010761 1969 51.6307427547122 1970 51.558107759928 1971 51.4889516546048 1972 51.4226297740977 1973 51.3593688998506 1974 51.2996186928933 1975 51.2438944766675 1976 51.192531114816 1977 51.1462717407303 1978 51.1083120447565 1979 51.0775657661008 1980 51.0494559250943 1981 51.0220168668873 1982 50.9961930107772 1983 50.9747751781962 1984 50.9584982308698 1985 50.9415660229815 1986 50.92141244132 1987 50.9008193377093 1988 50.8766617601039 1989 50.8486890723902 1990 50.8201843644557 1991 50.7912268285596 1992 50.7614637312108 1993 50.717143392402 1994 50.6741067705441 1995 50.6382771816672 1996 50.592518206407 1997 50.5435706696669 1998 50.5014517366847 1999 50.4667612076678 2000 50.4356444670159 2001 50.4056757303515 2002 50.3727974834572 2003 50.3389253823633 2004 50.304361715684 2005 50.2936221588312 2006 50.2821437713973 2007 50.2455028532819 2008 50.2138277245449 2009 50.1886069620608 2010 50.1650167112901 2011 50.1417073978191 2012 50.1143490194504 2013 50.0848407126775 2014 50.0568166616485 2015 50.0309847913381 2016 50.0069049212328 2017 49.9843361678273 2018 49.9632139970553 2019 49.9438344131424 2020 49.9271184817232 2021 49.9133369931818 2022 49.9036686062256 2023 49.8956816201589