Year	% of cohort
1960	27.018756
1961	27.011871
1962	27.1038
1963	27.21634
1964	27.39984
1965	27.548999
1966	27.793436
1967	28.364534
1968	28.589595
1969	29.055034
1970	29.472205
1971	29.777409
1972	30.514615
1973	31.000008
1974	31.676828
1975	32.231952
1976	32.613337
1977	33.232653
1978	33.859948
1979	34.313902
1980	34.497896
1981	35.162896
1982	35.513358
1983	35.826998
1984	35.860391
1985	34.212262
1986	35.44063
1987	34.837851
1988	34.009576
1989	33.150073
1990	14.592903
1991	31.694461
1992	30.502803
1993	29.605628
1994	28.148958
1995	32.119576
1996	32.252353
1997	38.978296
1998	40.193498
1999	40.897943
2000	43.320952
2001	45.345314
2002	46.449195
2003	42.884648
2004	49.014107
2005	50.044417
2006	51.157204
2007	51.984727
2008	52.523207
2009	52.940851
2010	53.401504
2011	53.387921
2012	53.73358
2013	53.614009
2014	52.149381
2015	51.58283
2016	54.06973
2017	54.028152
2018	54.078645
2019	54.74247
2020	53.39471
2021	52.890384
2022	53.817804