Year % of total population 1960 50.8557869209974 1961 50.7269842158028 1962 50.6323964066135 1963 50.5637612027347 1964 50.5476648839605 1965 50.5922370948764 1966 50.6920205760145 1967 50.8601296778906 1968 51.0872577283615 1969 51.3642283775867 1970 51.6856164839259 1971 52.0485299672394 1972 52.4520521556741 1973 52.8837517275926 1974 53.3136621596065 1975 53.7167586228304 1976 54.0953389628266 1977 54.4585274162654 1978 54.8061277711196 1979 55.137941931796 1980 55.4564500371077 1981 55.7660164850984 1982 56.0697846055479 1983 56.3666955761154 1984 56.6509004520642 1985 56.9186943028149 1986 57.1587674207275 1987 57.3763747906318 1988 57.5941995992717 1989 57.8217321475148 1990 58.0648597694275 1991 58.3299958739188 1992 58.6192080123048 1993 58.9302076789738 1994 59.2600016829297 1995 59.6023469276678 1996 59.9486698419273 1997 60.2897437797343 1998 60.6243670443514 1999 60.9592781262054 2000 61.2958568783831 2001 61.6519165860504 2002 62.0227580682643 2003 62.3890668649288 2004 62.7436241386572 2005 63.0717552950342 2006 63.3692125591613 2007 63.6348935730382 2008 63.8723568655974 2009 64.0852232154306 2010 64.274544174126 2011 64.44846723583 2012 64.6144205719999 2013 64.7777567959726 2014 64.9376581861809 2015 65.0859903184163 2016 65.1530106886421 2017 64.9612567252956 2018 64.3898519906648 2019 63.7732805551324 2020 63.5214125320961 2021 63.491135676121 2022 63.8172472741077 2023 64.4479138806774