Year % of total population 1960 51.1460216203977 1961 51.1335151658612 1962 51.1191531598441 1963 51.1019689363668 1964 51.0820662176701 1965 51.0585712476085 1966 51.0308769489336 1967 51.0006042669008 1968 50.9678972016539 1969 50.9318059625183 1970 50.8954362276297 1971 50.8629765689501 1972 50.8343915726147 1973 50.810613762173 1974 50.7844358820721 1975 50.7509351416878 1976 50.7209360770117 1977 50.6864259252094 1978 50.6375314531861 1979 50.5808238258463 1980 50.5162664982962 1981 50.4396481921294 1982 50.314491482778 1983 50.2044582249741 1984 50.1558044459553 1985 50.1157751615727 1986 50.0778639660243 1987 50.0412755624415 1988 50.0075754836188 1989 49.9752136367308 1990 49.9429045062181 1991 49.9063138796408 1992 49.8667067642793 1993 49.8292491314977 1994 49.8017765567457 1995 49.7830859328636 1996 49.7649660331972 1997 49.7476154203141 1998 49.7311345318039 1999 49.7156017915639 2000 49.7009005023392 2001 49.6872063187588 2002 49.674210991569 2003 49.6608727860076 2004 49.6468996227641 2005 49.6330413268626 2006 49.6191511053274 2007 49.605515410168 2008 49.5925555302565 2009 49.5802807002337 2010 49.5692499567321 2011 49.5597417539935 2012 49.5516880739985 2013 49.5448386277285 2014 49.5393967317774 2015 49.5352727783146 2016 49.5321712523059 2017 49.5299185588661 2018 49.5285687223682 2019 49.528923139482 2020 49.5215034881059 2021 49.5043780886746 2022 49.4897698418979 2023 49.4817993297158