Year % of total population 1960 50.5790660479361 1961 50.5182589345421 1962 50.4488129717283 1963 50.3813899158215 1964 50.3212043509977 1965 50.268043184947 1966 50.2255072392082 1967 50.1958295868542 1968 50.1674976795454 1969 50.1306364856038 1970 50.1342806998244 1971 50.1681896838087 1972 50.1548877585188 1973 50.1137964047598 1974 50.0786369467315 1975 50.0377978248162 1976 49.9871300003063 1977 49.9314746407679 1978 49.8750933221604 1979 49.8288749006777 1980 49.7946311753132 1981 49.7635416424046 1982 49.7322432850475 1983 49.7002530605788 1984 49.6704427277867 1985 49.6461682557315 1986 49.6336566093728 1987 49.6268641896556 1988 49.6098722717947 1989 49.5852102629802 1990 49.5744833787248 1991 49.5729564511919 1992 49.551424755238 1993 49.5244481282828 1994 49.5078411034137 1995 49.4927332641548 1996 49.4891151198345 1997 49.4962545618288 1998 49.4961255688043 1999 49.4974963304008 2000 49.5134342240031 2001 49.5345592262212 2002 49.5474069386386 2003 49.5513520949922 2004 49.5552316475591 2005 49.5619556494995 2006 49.5657104463141 2007 49.5626605422315 2008 49.5595456766148 2009 49.5592193074717 2010 49.5594288347708 2011 49.5668292402667 2012 49.585562937815 2013 49.6050487097893 2014 49.6146320840496 2015 49.6161129623242 2016 49.6192729085596 2017 49.632517040107 2018 49.6573616047024 2019 49.6797928415591 2020 49.6890616873815 2021 49.6920457003132 2022 49.6961421272566 2023 49.7014501141801