Year	% of total population
1960	19.752758725788265
1961	19.76999988407388
1962	19.783979039550374
1963	19.790102622010995
1964	19.795866664405718
1965	19.81059914465809
1966	19.840433998141048
1967	19.883524678100077
1968	19.937356481408926
1969	19.99698265855337
1970	20.062728617048094
1971	19.9069458144507
1972	19.732805891492784
1973	19.59606251890207
1974	19.49200609150753
1975	19.419894569282782
1976	19.379936926496807
1977	19.371001182108618
1978	19.391672300453465
1979	19.43828313696436
1980	19.506128335637484
1981	19.56402763449682
1982	19.62988932950404
1983	19.6783123114407
1984	19.71800019849906
1985	19.753525553736885
1986	19.78506137474745
1987	19.808480949286864
1988	19.82026070284083
1989	19.827177003695294
1990	19.84044875727885
1991	19.811043912288177
1992	19.747132444118687
1993	19.70722264336265
1994	19.687749116922273
1995	19.680849749462396
1996	19.679977188790218
1997	19.681347618308532
1998	19.682070242976145
1999	19.681729893169834
2000	19.682821331681822
2001	19.688113799223224
2002	19.697931549282988
2003	19.60351335276386
2004	19.490536283504024
2005	19.387559115975527
2006	19.295900851018104
2007	19.213670909033958
2008	19.136009770313045
2009	19.059095459305155
2010	18.981300690665368
2011	18.90206050071203
2012	18.819271589993715
2013	18.7342065978606
2014	18.703231002117363
2015	18.727661828232257
2016	18.76168884321406
2017	18.808484700396644
2018	18.859657330827268
2019	18.89614080857692
2020	18.940626499354288
2021	19.036915268969434
2022	19.137124938381803
2023	19.196389210402405