Year	% of total population
1960	21.2142866237172
1961	21.4909329820871
1962	21.7289558921001
1963	21.9288496188925
1964	22.1234911379489
1965	22.3228742790954
1966	22.4787283061743
1967	22.5500991627416
1968	22.5249335032406
1969	22.4059134619648
1970	22.2194718013096
1971	21.9551101630111
1972	21.5564631825924
1973	21.1792569003339
1974	20.8692979535384
1975	20.53912372249
1976	20.1949203262815
1977	19.8473761850466
1978	19.5439098897995
1979	19.1838967079232
1980	18.775859746358
1981	18.4423811914737
1982	18.1321571420744
1983	17.7949625178381
1984	17.4819802640662
1985	17.2166039960051
1986	17.0127930032322
1987	16.9273992548441
1988	16.9972043102894
1989	17.1756656736057
1990	17.3857393712797
1991	17.5990590025582
1992	17.8217493027105
1993	18.0627556261383
1994	18.2857078898179
1995	18.4577888824698
1996	18.5779819289136
1997	18.6953513467006
1998	18.8186938040269
1999	18.927747505814
2000	18.9629684042348
2001	18.9321460987491
2002	18.8838617441763
2003	18.7905656677778
2004	18.6765285716002
2005	18.5376441699051
2006	18.3944445796866
2007	18.2452067597686
2008	18.0533342338
2009	17.8481043168069
2010	17.6671048051598
2011	17.3709875995261
2012	17.0781468361778
2013	16.9229126136718
2014	16.7532116039452
2015	16.5662552741227
2016	16.3563617787576
2017	16.1887192731633
2018	16.0999189028693
2019	16.0251333525815
2020	15.9809771422725
2021	15.9137585031619
2022	15.7999008645782
2023	15.6897677419847