Year	% of total population
1960	30.8150597901274
1961	30.911909245413
1962	30.7465032189344
1963	30.5746264158692
1964	30.5411358051448
1965	30.5807501496956
1966	30.2536787919678
1967	29.7187676522059
1968	29.2800311264602
1969	28.7856045443276
1970	28.2838049773687
1971	27.7492804778041
1972	27.1327432942735
1973	26.455187421058
1974	25.7839546545484
1975	25.1122781429568
1976	24.4399205810557
1977	23.829136533117
1978	23.2887109682701
1979	22.8255647208831
1980	22.4725799744266
1981	22.2273317653635
1982	22.0509827661445
1983	21.883597325446
1984	21.7107495589798
1985	21.5316995876208
1986	21.3752888828725
1987	21.3186733449385
1988	21.359014985376
1989	21.4428375710267
1990	21.556647253275
1991	21.6838553496237
1992	21.7920071457062
1993	21.8585925811232
1994	21.8608729639584
1995	21.8024990164564
1996	21.720343783201
1997	21.648405466966
1998	21.5896705355766
1999	21.5255083007688
2000	21.4254043241312
2001	21.2853478322796
2002	21.1399362675084
2003	20.9923988119116
2004	20.815553884976
2005	20.6109221090081
2006	20.4194910439258
2007	20.2652113320978
2008	20.1357098160385
2009	20.0067943540569
2010	19.8668858175649
2011	19.7438057892103
2012	19.6422329152387
2013	19.5369619001623
2014	19.4233952283111
2015	19.2971595367802
2016	19.1742051083628
2017	19.0559237747833
2018	18.9110216801249
2019	18.7358999565657
2020	18.5113495341764
2021	18.2430347046008
2022	17.9594381099047
2023	17.6748321751787