Year % of total population 1960 50.888373466954 1961 50.3493072517252 1962 49.7684210526316 1963 49.1462847201149 1964 48.5226781433007 1965 47.9332299988077 1966 47.3927004867576 1967 46.929836371633 1968 46.5608534726758 1969 46.3489779508231 1970 46.4017203589595 1971 46.5895150742134 1972 46.74500615734 1973 46.8839408866995 1974 47.0288446586845 1975 47.2958922332398 1976 47.6805909875891 1977 48.0874999082117 1978 48.4922534324222 1979 48.8709558006959 1980 49.2565439975746 1981 49.7301094350784 1982 50.2042208931917 1983 50.5462887608697 1984 50.7298641698206 1985 50.8237144089601 1986 50.9511548134923 1987 51.1252778102702 1988 51.3160867762095 1989 51.5057822148975 1990 51.7006728207263 1991 51.8710296763675 1992 52.1301947719253 1993 52.518713644545 1994 52.9480989436336 1995 53.4242335666019 1996 53.9474029083995 1997 54.5049443387667 1998 55.0720964665395 1999 55.6200546977552 2000 56.1287987820604 2001 56.5728669344356 2002 56.9650021290144 2003 57.344563216388 2004 57.7185043095449 2005 58.1027195720018 2006 58.513591441124 2007 58.9547856723429 2008 59.4204889889964 2009 59.9168286010303 2010 60.5690974879427 2011 61.3250388802488 2012 62.025639428112 2013 62.6917135086129 2014 63.3361715412888 2015 63.9524996457064 2016 64.528568997788 2017 65.0476989859712 2018 65.5020336800448 2019 65.9670517482877 2020 66.4179246202717 2021 66.8084473453307 2022 67.1740618966251 2023 67.4943102294164