Year % of total population 1960 48.312250060459 1961 48.3310693996661 1962 48.3504707880002 1963 48.3708140159349 1964 48.392840395227 1965 48.4183359664251 1966 48.4505705706037 1967 48.4907715455602 1968 48.5372409360347 1969 48.5904854051691 1970 48.6506178252687 1971 48.7183493546142 1972 48.7943678648452 1973 48.8771419412693 1974 48.9635991195721 1975 49.0497229052557 1976 49.1335181755643 1977 49.2138197434112 1978 49.2896199728865 1979 49.3591062417072 1980 49.4185226985919 1981 49.4669933923045 1982 49.5037333765714 1983 49.5273646203694 1984 49.5445670024143 1985 49.5616778751016 1986 49.571892162323 1987 49.5765826633336 1988 49.5780943333662 1989 49.5733091137924 1990 49.5602439529093 1991 49.5376895717071 1992 49.3301026959139 1993 48.9316585598561 1994 48.6600590591469 1995 48.5938376126875 1996 48.6493381999007 1997 48.708738785122 1998 48.7465914826495 1999 48.7691589770706 2000 48.7796906217474 2001 48.7845810134705 2002 48.7989500787203 2003 48.8108415474417 2004 48.8061387543871 2005 48.7969485359758 2006 48.7854372726453 2007 48.7824723120176 2008 48.7860451104024 2009 48.7863838566179 2010 48.7856223734535 2011 48.7867679078165 2012 48.7840377707876 2013 48.8077457755354 2014 48.8713740539245 2015 48.9432299641009 2016 49.0110847903439 2017 49.0700509036702 2018 49.1227244613366 2019 49.1712616764726 2020 49.2059593654425 2021 49.2264157461625 2022 49.2284274194795 2023 49.2194115758241