Year % of total population 1960 49.4894447188077 1961 49.4363875563956 1962 49.3831273548405 1963 49.3198057150716 1964 49.2492717169666 1965 49.1756718286296 1966 49.1043930928722 1967 49.0422457116569 1968 48.9968268423524 1969 48.9730920127323 1970 48.9526482684406 1971 48.9220774272489 1972 48.8891496629417 1973 48.8549477679312 1974 48.8204932501424 1975 48.7886855386814 1976 48.7589291153389 1977 48.7291739304695 1978 48.6956915072619 1979 48.6610481686611 1980 48.6368619360362 1981 48.6212223246596 1982 48.6081032489153 1983 48.5954133415744 1984 48.5810860268364 1985 48.5634030565318 1986 48.5411418578443 1987 48.5152641778615 1988 48.486970931516 1989 48.4584067950486 1990 48.4305159242571 1991 48.4035546116335 1992 48.376653124359 1993 48.3462765742931 1994 48.3104259839287 1995 48.2740778747982 1996 48.241526292116 1997 48.2126698156519 1998 48.1874851726629 1999 48.1654490743718 2000 48.1460936038387 2001 48.1276866578935 2002 48.1082538693888 2003 48.08789563439 2004 48.0662618675166 2005 48.0427973919206 2006 48.0178470122712 2007 47.9918632000509 2008 47.9643093139565 2009 47.9358181558993 2010 47.9039366613931 2011 47.8684932931775 2012 47.8314308302816 2013 47.7914356166415 2014 47.7466074533498 2015 47.6941728487548 2016 47.6327947936634 2017 47.5644960444486 2018 47.4851541107394 2019 47.3977697989636 2020 47.31198900587 2021 47.2350053500768 2022 47.1693425822783 2023 47.1108304292163