Year % of total population 1960 53.2036187155826 1961 53.0407223231403 1962 52.8158969802959 1963 52.5030775969864 1964 52.1707834809516 1965 51.8724922354579 1966 51.5458547557558 1967 51.2684146375083 1968 51.1506835888417 1969 51.1634001076669 1970 51.2689643298777 1971 51.4706370464141 1972 51.7331897282923 1973 52.0075956549193 1974 52.2794558316628 1975 52.5427044270883 1976 52.7998957841045 1977 53.0625484077929 1978 53.3542114467346 1979 53.6791922185608 1980 54.0370736115106 1981 54.4001082435628 1982 54.7384089590639 1983 55.0631018799805 1984 55.3794934893899 1985 55.6593404682553 1986 55.9013390594319 1987 56.1709243453627 1988 56.5215149709278 1989 56.9751802118018 1990 57.5037616897631 1991 58.07913575704 1992 58.6894180543343 1993 59.3051732432916 1994 59.9321414855058 1995 60.5684874127699 1996 61.2352195789217 1997 61.9560684969236 1998 62.7214030414746 1999 63.5446917149219 2000 64.4076700070871 2001 65.28232492575 2002 66.1330740385837 2003 66.9039694527986 2004 67.5587721585358 2005 68.0823590322789 2006 68.5101136465311 2007 68.8710236655164 2008 69.1498163384722 2009 69.3328701378909 2010 69.3994458498976 2011 69.4159022037335 2012 69.3048466300108 2013 69.0243064234356 2014 68.6666480589465 2015 68.2545525509076 2016 67.8364757511712 2017 67.4257116594475 2018 67.0503366639595 2019 66.7259176217799 2020 66.4714366541649 2021 66.2836238535177 2022 66.1390103379565 2023 66.0018808460886