Year	% of total population
1960	3.886575895747622
1961	3.915883568990042
1962	3.932004446242699
1963	3.9440190029544144
1964	3.9617270389288857
1965	3.997163180817986
1966	4.030637956780052
1967	4.054345053279564
1968	4.088590228230171
1969	4.12058703718957
1970	4.139930578503897
1971	4.162680819343737
1972	4.19445521325222
1973	4.21949250429691
1974	4.2462659204944515
1975	4.27311455297667
1976	4.300026312360863
1977	4.332818032486694
1978	4.358004642778542
1979	4.367502116625034
1980	4.355819774207359
1981	4.321348456203333
1982	4.272932210180452
1983	4.2311510355409085
1984	4.201444909241394
1985	4.169678240434168
1986	4.14758717207052
1987	4.141673070818159
1988	4.1438329494605215
1989	4.152926887785218
1990	4.156737728369108
1991	4.171866393983148
1992	4.180337163643751
1993	4.184721542774421
1994	4.180956498576434
1995	4.169068914588245
1996	4.153994673205041
1997	4.1314491149684605
1998	4.098474618255261
1999	4.0586817538548186
2000	4.033549660345215
2001	4.026123165015813
2002	4.0320489175080025
2003	4.040966249059139
2004	4.043097853208323
2005	4.037002463012722
2006	4.023567011853686
2007	4.001319463604366
2008	3.966484762878423
2009	3.9325589109149366
2010	3.901598910120385
2011	3.8828553584272814
2012	3.8788157708725732
2013	3.878854844343329
2014	3.8867653578816728
2015	3.9050539712954047
2016	3.927310897878301
2017	3.9529450969448408
2018	3.980775884642824
2019	4.010439171407715
2020	4.02674436716458
2021	4.023362300044983
2022	3.9918029246296416
2023	4.031954377793113