Year % of total population 1960 46.5591937588051 1961 46.763514676296 1962 46.9146613915197 1963 47.0113695203862 1964 47.0867178250248 1965 47.1789443729351 1966 47.2718886868412 1967 47.3428155159727 1968 47.3928350352892 1969 47.4274000000903 1970 47.4413372043883 1971 47.3234248675247 1972 47.0853290027932 1973 46.8394182588197 1974 46.5832370438104 1975 46.318181618371 1976 46.040649985896 1977 45.7397064252394 1978 45.4046895625932 1979 45.0207988393782 1980 44.5844543177568 1981 44.1164985840688 1982 43.6393346693976 1983 43.1473625956059 1984 42.6305282552462 1985 42.0940438005628 1986 41.5232219938912 1987 40.9109834734932 1988 40.2897217146138 1989 39.6752097404498 1990 39.0491573294256 1991 38.4219459842253 1992 37.8440859078972 1993 37.3356745639981 1994 36.8703193765399 1995 36.4309528090733 1996 35.9964554841046 1997 35.5496840446187 1998 35.1078087501811 1999 34.6702832548276 2000 34.2390141660646 2001 33.8198317794681 2002 33.4005939985521 2003 32.9839362141361 2004 32.5530230832867 2005 32.0999365705835 2006 31.6409361718132 2007 31.187261590686 2008 30.7481385574406 2009 30.3178818250289 2010 29.8856599082324 2011 29.4625574113875 2012 29.0336763715449 2013 28.5773698543181 2014 28.1017957951769 2015 27.6102725248279 2016 27.1278367266367 2017 26.6640747970981 2018 26.1947604945758 2019 25.7379262771227 2020 25.3368030520634 2021 24.9531348918147 2022 24.5070948704323 2023 24.0194713554901