Year % of total population 1960 50.236845942953266 1961 50.230280744450965 1962 50.22501298670952 1963 50.22061076783415 1964 50.21641122964764 1965 50.21262227968607 1966 50.209065870370914 1967 50.20599817153039 1968 50.20405211697766 1969 50.2029617477325 1970 50.20307301251982 1971 50.16017232667949 1972 50.117338122200806 1973 50.117260464336745 1974 50.12014361926571 1975 50.110172334097655 1976 50.09180691091854 1977 50.081998551870264 1978 50.07189443581215 1979 50.06015832121726 1980 50.05141812971033 1981 50.045494910860725 1982 50.040684609618005 1983 50.03721245446382 1984 50.03208916125254 1985 50.02778452985636 1986 50.025755967594336 1987 50.02424635994311 1988 50.01818364786238 1989 50.01402579991513 1990 50.01862831760455 1991 50.025962997877514 1992 50.032644150356305 1993 50.03727834940571 1994 50.03750940307869 1995 50.030560014977915 1996 50.018018035486755 1997 50.0049555929982 1998 49.99052514196142 1999 49.97509534657012 2000 49.96523085919034 2001 49.955516230252165 2002 49.943414336937906 2003 49.93066540175703 2004 49.91699394416545 2005 49.90125053853454 2006 49.880182137407346 2007 49.85836984677062 2008 49.83489292403035 2009 49.81131323981589 2010 49.79612607244762 2011 49.785533821040154 2012 49.775270435632585 2013 49.7647742862009 2014 49.75540215823211 2015 49.750188766182 2016 49.750379662251405 2017 49.75218199761007 2018 49.75086621962303 2019 49.74689722471001 2020 49.74696325355387 2021 49.75013413034291 2022 49.74789944923205 2023 49.74272920170921