Year % of total population 1960 50.1812358998414 1961 50.1813714423427 1962 50.1833266330195 1963 50.1868932038835 1964 50.1865523687753 1965 50.1887466395954 1966 50.2068036440499 1967 50.2214651847005 1968 50.227288330209 1969 50.2400116854463 1970 50.2576669197063 1971 50.2679795332201 1972 50.2748123782909 1973 50.2913998478555 1974 50.3074989085106 1975 50.3273639751404 1976 50.3499478679507 1977 50.3735629838642 1978 50.3995139458467 1979 50.421236476567 1980 50.44287792576 1981 50.4707605512878 1982 50.495500410578 1983 50.513712731666 1984 50.5371313464091 1985 50.5541659432308 1986 50.5643126902988 1987 50.5589156625355 1988 50.536992003854 1989 50.5381263729947 1990 50.5557525445371 1991 50.5553175284369 1992 50.5431515316372 1993 50.5433270193704 1994 50.5491568664842 1995 50.5518160691097 1996 50.5520471253061 1997 50.5430122989567 1998 50.5277010322957 1999 50.5064832091852 2000 50.4732140749848 2001 50.4487023420603 2002 50.4419361903809 2003 50.4346281308 2004 50.4223068425533 2005 50.4029142098441 2006 50.3533188717567 2007 50.2515831039603 2008 50.1415493764068 2009 50.0720719937199 2010 50.0171890494813 2011 49.9332904147138 2012 49.8388143108983 2013 49.7720575325922 2014 49.7194294270272 2015 49.6720263504083 2016 49.6361563536576 2017 49.6158329720438 2018 49.6088526293597 2019 49.5906066231773 2020 49.5687696230315 2021 49.5548879043779 2022 49.5411660596295 2023 49.5294609780869