Year	% of total population
1960	21.76843330762837
1961	22.2588696185424
1962	22.83730810928155
1963	23.483538481949378
1964	24.15110918615266
1965	24.809372921499083
1966	25.417978973143907
1967	26.021558049619024
1968	26.684334837968986
1969	27.439732791170492
1970	28.25648604097486
1971	28.915101240669838
1972	29.23378051145801
1973	29.6125045721365
1974	30.02264444340797
1975	30.265324614125994
1976	30.32375396570583
1977	30.457543063694935
1978	30.59402485206988
1979	30.746456578781178
1980	30.982229202888668
1981	31.126591190572857
1982	30.981816970874853
1983	30.848431650757156
1984	30.741361917039356
1985	30.6682101406239
1986	30.61290051692484
1987	30.556591882782975
1988	30.49166268389615
1989	30.378498513999407
1990	30.104046449118506
1991	29.80831162856094
1992	29.69030569202354
1993	29.624455626282515
1994	29.58479098389582
1995	29.555072720495527
1996	29.533377950380817
1997	29.495869108892297
1998	29.440617045328725
1999	29.435689423732203
2000	29.423380463543307
2001	29.342278293064382
2002	29.217790974921897
2003	29.131072549864705
2004	29.042045191385483
2005	28.94006669874002
2006	28.836375792374152
2007	28.746153427718017
2008	28.65312834874593
2009	28.56115192765078
2010	28.507659283174576
2011	28.53313659133685
2012	28.671035275564687
2013	28.862764245941097
2014	29.03864368712424
2015	29.213466220825048
2016	29.31802618993685
2017	29.35885859540764
2018	29.40123631285614
2019	29.418718245124648
2020	29.474466703537537
2021	29.834357487747187
2022	30.24652824098854
2023	30.444678971113166