Year % of total population 1960 46.0933630510154 1961 46.2399566669676 1962 46.3774473249404 1963 46.5085227272727 1964 46.6376063895824 1965 46.761385701086 1966 46.8789395022419 1967 46.992220499048 1968 47.1265070553422 1969 47.2874925903972 1970 47.4608993438215 1971 47.6480021381799 1972 47.8470551425766 1973 48.0504143718582 1974 48.2569085939872 1975 48.4540731300853 1976 48.6353841334333 1977 48.7988305491454 1978 48.6910014707849 1979 47.8334373699542 1980 47.2587088256204 1981 47.4335536492758 1982 47.607234056308 1983 47.7738415533797 1984 47.9329806811269 1985 48.0878011403331 1986 48.2364750014653 1987 48.3744891251536 1988 48.502731174405 1989 48.6278799573314 1990 48.7142270118371 1991 48.7600046548313 1992 48.8021592034154 1993 48.8415729507592 1994 48.8784822286263 1995 48.9133237990294 1996 48.9434160971645 1997 48.9704871108229 1998 48.9988420868653 1999 49.0252464893935 2000 49.0654643522809 2001 49.1153811017388 2002 49.1591836734694 2003 49.200030879387 2004 49.2411332159569 2005 49.2836531392442 2006 49.3215146036972 2007 49.3568941732904 2008 49.3921830118999 2009 49.4311378494633 2010 49.4693485107128 2011 49.5037684942736 2012 49.538499803741 2013 49.5712128226339 2014 49.6004475284058 2015 49.6259559105478 2016 49.6458558424959 2017 49.6607967916097 2018 49.6750734952808 2019 49.689228788058 2020 49.6985738806808 2021 49.7062390133391 2022 49.7132276427741 2023 49.7162980634129