Year % of total population 1960 44.1613140995851 1961 44.4707717306042 1962 44.7454088475166 1963 44.9953740665527 1964 45.1753320876636 1965 45.2553719593369 1966 45.2693769173263 1967 45.2287532201088 1968 45.1247534671226 1969 44.9510447449022 1970 44.7019490090001 1971 44.3851312476317 1972 44.0048647283381 1973 43.5529304413785 1974 43.0361320992227 1975 42.4623875578239 1976 41.8323689064657 1977 41.1223273322008 1978 40.3398558912698 1979 39.5262344305779 1980 38.7019456475929 1981 37.8707918704127 1982 37.0120796097881 1983 36.1116874633396 1984 35.1917449750336 1985 34.2755299811055 1986 33.3776553587443 1987 32.4982142203993 1988 31.6402955052422 1989 30.8406013297547 1990 30.0039140182011 1991 29.1925607057393 1992 28.4716552901683 1993 27.8017467504979 1994 27.228326464811 1995 26.7352902766603 1996 26.2698440167905 1997 25.769286542115 1998 25.2426329637808 1999 24.6824992689492 2000 24.0559882704955 2001 23.4155008464115 2002 22.833184216517 2003 22.3037819189898 2004 21.8168568741895 2005 21.3485104125127 2006 20.8841227376101 2007 20.455788713423 2008 20.0708352102389 2009 19.7036331334073 2010 19.2891783791883 2011 18.8288657116604 2012 18.394079080009 2013 18.0145871713937 2014 17.6946607194817 2015 17.402461678418 2016 17.1132609629264 2017 16.8365777679625 2018 16.5790776158105 2019 16.3259910425181 2020 16.0659765534604 2021 15.8003767064873 2022 15.5197566448691 2023 15.2252503747183