Year % of total population 1960 47.418488927076886 1961 47.47275271208303 1962 47.52576194757412 1963 47.57734655823661 1964 47.62517548614519 1965 47.66825881737214 1966 47.70802376744285 1967 47.74265403087445 1968 47.773248218776345 1969 47.79955399639366 1970 47.80847362672584 1971 47.824085420331365 1972 47.86094794620265 1973 47.896355920584455 1974 47.93103343162421 1975 47.962366318706465 1976 47.98301712636196 1977 47.99954758548727 1978 48.01679973439378 1979 48.031041103619046 1980 48.05155285660446 1981 48.07511398100093 1982 48.09531373073877 1983 48.116403057900584 1984 48.13649596764448 1985 48.15636085657613 1986 48.1784290678166 1987 48.20256748332898 1988 48.22635675825555 1989 48.251024865886315 1990 48.27468032199494 1991 48.2923270592428 1992 48.30425474009026 1993 48.30985283264909 1994 48.30988491563044 1995 48.305335757114435 1996 48.3001888158889 1997 48.2967144832461 1998 48.29413316875464 1999 48.29156866477961 2000 48.29112332015274 2001 48.28951832601209 2002 48.28820825972691 2003 48.28962257266487 2004 48.29113650975507 2005 48.29284436856641 2006 48.29609863102851 2007 48.304852310827 2008 48.31849027219711 2009 48.33197348167875 2010 48.34761224333269 2011 48.36513756562263 2012 48.38552199745285 2013 48.40665356309495 2014 48.427102793925684 2015 48.44886038675919 2016 48.470750892033635 2017 48.490575119940836 2018 48.509179594796834 2019 48.523704462402854 2020 48.53105924942682 2021 48.53383717016484 2022 48.54608789735878 2023 48.55020066094192