Year % of total population 1960 58.5950801357681 1961 58.4296494346734 1962 58.3935267013902 1963 58.4782604169294 1964 58.6786464225016 1965 58.9871680886677 1966 59.4237414101283 1967 59.9719620443894 1968 60.5605961838041 1969 61.159016360202 1970 61.8787508612836 1971 62.6541396125367 1972 63.3484137341627 1973 64.0265484503642 1974 64.708368226588 1975 65.3534980514562 1976 65.9407196394336 1977 66.4786334109885 1978 66.9842986531207 1979 67.4507983856063 1980 67.8371093383702 1981 68.1105432624511 1982 68.2783720147597 1983 68.3782849907373 1984 68.4365667931883 1985 68.470922650032 1986 68.4715017048315 1987 68.4000993535983 1988 68.2956993874786 1989 68.1934706155825 1990 68.0650931297124 1991 67.9126504525908 1992 67.7645005410591 1993 67.6704263594953 1994 67.6525257064596 1995 67.6823570010641 1996 67.7417053793848 1997 67.8267868367679 1998 67.9473071518907 1999 68.1236745893946 2000 68.3318579113647 2001 68.5418226843495 2002 68.7443023998354 2003 68.930016176752 2004 69.1210426681388 2005 69.3162053812159 2006 69.4619555649849 2007 69.5235674470308 2008 69.5148015307897 2009 69.468868426388 2010 69.3789809843166 2011 69.187020705999 2012 68.8781467973837 2013 68.5147194001909 2014 68.1408095240032 2015 67.7545145228694 2016 67.3790409090975 2017 67.0474708924841 2018 66.7549370661802 2019 66.4551664877988 2020 66.1132110479891 2021 65.7453482127066 2022 65.3885933304723 2023 65.0490301489831