Year % of total population 1960 46.7883555176631 1961 46.9765017753223 1962 47.1305948818072 1963 47.2570408058681 1964 47.3089326010684 1965 47.2613613817694 1966 47.1533522186831 1967 46.9809983591261 1968 46.7321680615673 1969 46.4108827350137 1970 46.0164655258434 1971 45.5669964049048 1972 45.0621563179434 1973 44.4966097663154 1974 43.8944027567978 1975 43.2726794714911 1976 42.6492992672083 1977 42.0129860075052 1978 41.3681177532459 1979 40.7423136257359 1980 40.1367834426811 1981 39.5679725313039 1982 39.044677790726 1983 38.5558453436589 1984 38.1128805600691 1985 37.7243473549704 1986 37.3863265245055 1987 37.0908861282524 1988 36.8177448649694 1989 36.555647119296 1990 36.2943362005166 1991 36.0343243105763 1992 35.761569442199 1993 35.4587157752327 1994 35.1213488895923 1995 34.7572821660968 1996 34.3747707811843 1997 33.9662407797952 1998 33.5416059720726 1999 33.1085721761596 2000 32.6640411582921 2001 32.2033554751603 2002 31.7230293595206 2003 31.2236504119637 2004 30.7004227558704 2005 30.1531645197857 2006 29.574369964241 2007 28.968455983994 2008 28.3533989589439 2009 27.7376912991014 2010 27.131883027415 2011 26.5407207694374 2012 25.9687108699394 2013 25.4177176616687 2014 24.8851690071116 2015 24.3738609866339 2016 23.8796363886075 2017 23.3589271750187 2018 22.8196598526068 2019 22.3280525563719 2020 21.9223616028949 2021 21.5959743198702 2022 21.3429345677906 2023 21.1199839186463