Year	% of total population
1960	23.08215676422649
1961	22.964794457586393
1962	22.813829267991647
1963	22.657188156154056
1964	22.496148495784976
1965	22.34006047953696
1966	22.173564127938754
1967	21.998189507439207
1968	21.874037055032613
1969	21.788482950334327
1970	21.70240171333235
1971	21.58045309621435
1972	21.334969733706725
1973	21.098335577565063
1974	20.944401120247065
1975	20.882336137565026
1976	20.801847855898963
1977	20.677472078092816
1978	20.578223174019033
1979	20.497799501286522
1980	20.382722781962567
1981	20.23412179882701
1982	20.230811682910534
1983	20.274732177452524
1984	20.287249746542784
1985	20.28893646187005
1986	20.287262770955195
1987	20.285649935191177
1988	20.2681707303729
1989	20.188220669232255
1990	20.046054559544665
1991	19.85817724581816
1992	19.653911400104253
1993	19.50545895565858
1994	19.443448295501657
1995	19.42662297418384
1996	19.41333961216567
1997	19.404229973214242
1998	19.395849633229613
1999	19.371023997525626
2000	19.337380482167905
2001	19.30892097564712
2002	19.481110825014287
2003	19.655779535187367
2004	19.80599282963243
2005	19.94444707103174
2006	20.037222561724473
2007	20.142506401372216
2008	20.316346964536184
2009	20.501495627102052
2010	20.69311730008499
2011	20.866354777008507
2012	21.01639254419133
2013	21.138589803112637
2014	21.221020982509973
2015	21.23158517958337
2016	21.250916253198586
2017	21.35199667726278
2018	21.49813342448935
2019	21.56931593978324
2020	21.64375278124686
2021	21.7167718294642
2022	21.677231796896454
2023	21.629305297423464