Year % of total population 1960 48.1302719188182 1961 48.3338625538671 1962 48.3928073974892 1963 48.4085045814429 1964 48.4277338591827 1965 48.4468750272134 1966 48.4536881539853 1967 48.4569530784297 1968 48.4668003302276 1969 48.4806272677983 1970 48.4930125699363 1971 48.4909506151617 1972 48.4685604955086 1973 48.4320893423854 1974 48.3910555759208 1975 48.362646665559 1976 48.3353272675755 1977 48.2970241084882 1978 48.2489601854825 1979 48.1881252395367 1980 48.1232029003625 1981 48.0954937709612 1982 48.1244310028238 1983 48.1723995660213 1984 48.2104482581192 1985 48.2521412674505 1986 48.2797756809685 1987 48.2710033464451 1988 48.2557379905056 1989 48.2539431723504 1990 48.2649483289593 1991 48.2692606564094 1992 48.2673877375696 1993 48.2577834000984 1994 48.2448320640157 1995 48.2397008999656 1996 48.2641586015298 1997 48.3179959456353 1998 48.3700965945732 1999 48.4203548073005 2000 48.4632430870026 2001 48.5114075210211 2002 48.5767869155449 2003 48.6362594545038 2004 48.6892963661411 2005 48.746385078666 2006 48.7952679229393 2007 48.8324283402078 2008 48.8703746860354 2009 48.9038016953506 2010 48.9285236374759 2011 48.9506900353572 2012 48.9742781490354 2013 49.0090428361338 2014 49.0426503762903 2015 49.0770084468833 2016 49.1030472572242 2017 49.142324500345 2018 49.2371067452678 2019 49.3497984168492 2020 49.4337042404974 2021 49.4799749832063 2022 49.4973575367647 2023 49.5001340199718