Year % of total population 1960 50.4874194811116 1961 50.461605473775 1962 50.4378071852651 1963 50.4149414461642 1964 50.3940901470474 1965 50.3729302782433 1966 50.3507002767543 1967 50.3298336526468 1968 50.3105881629818 1969 50.2927210914935 1970 50.2766022557401 1971 50.2617277740692 1972 50.2477983680635 1973 50.2342250227851 1974 50.2216045050804 1975 50.2101752172276 1976 50.2007870788624 1977 50.1913965020318 1978 50.1808013228174 1979 50.1714336178129 1980 50.1626875693233 1981 50.1541267644199 1982 50.1462388376455 1983 50.1390948633752 1984 50.1341631926982 1985 50.1312182570768 1986 50.1296241303336 1987 50.1289429038847 1988 50.128021352317 1989 50.126228956739 1990 50.1275228437607 1991 50.1325804226139 1992 50.1379751880888 1993 50.1415211528379 1994 50.1405375661833 1995 50.1379545187048 1996 50.1370230784805 1997 50.1362058249135 1998 50.1324869800946 1999 50.1261653543044 2000 50.1149779416662 2001 50.0952464093641 2002 50.0758065367441 2003 50.0578290405305 2004 50.038347992504 2005 50.0192678444106 2006 49.9964965789896 2007 49.9697457923581 2008 49.9380052855618 2009 49.9046663973444 2010 49.8759429820392 2011 49.8505833708154 2012 49.8243696918395 2013 49.7990466592942 2014 49.7752047824716 2015 49.750174551247 2016 49.7178241088323 2017 49.6795304375657 2018 49.635577132209 2019 49.5859077292817 2020 49.5385594606025 2021 49.4924710105902 2022 49.4556615971 2023 49.4302147972403