Year % of total population 1960 44.0794095741842 1961 44.3146820908274 1962 44.5300198377462 1963 44.6588918555173 1964 44.6940438430582 1965 44.6942458258558 1966 44.6828109883235 1967 44.6584009107801 1968 44.6213027273722 1969 44.568776213987 1970 44.4936623238173 1971 44.3884247759073 1972 44.2552565920672 1973 44.0974203635088 1974 43.9124365171912 1975 43.6974952524605 1976 43.4468561127076 1977 43.1614904887856 1978 42.8526428685711 1979 42.5261817938552 1980 42.1863704499269 1981 41.8439188171542 1982 41.4995461707273 1983 41.1495936787628 1984 40.7949469903454 1985 40.4393887108728 1986 40.0870918481752 1987 39.7323754232736 1988 39.3766266332156 1989 39.0255103592388 1990 38.6784866271844 1991 38.3406937063874 1992 38.0235302158963 1993 37.7246071057051 1994 37.4295272713686 1995 37.1283461555012 1996 36.8176598631287 1997 36.4972676266868 1998 36.1670684595478 1999 35.8222850608191 2000 35.4541006471544 2001 35.0573674668392 2002 34.636887792944 2003 34.2010029257169 2004 33.7566757181644 2005 33.3087158278699 2006 32.8599742388168 2007 32.4180699391317 2008 31.9880660534875 2009 31.5690081494884 2010 31.1618356625005 2011 30.7689276249058 2012 30.3747774379334 2013 29.9523446225032 2014 29.4956621740803 2015 29.0154602071561 2016 28.5200903794104 2017 28.0167107226328 2018 27.4679697477705 2019 26.9271441186519 2020 26.4899690256678 2021 26.0976437622379 2022 25.6930976056886 2023 25.28684228523