Year	% of cohort
1960	26.142167
1961	26.438255
1962	26.570196
1963	26.77135
1964	26.999612
1965	27.285895
1966	27.67519
1967	27.951841
1968	28.471581
1969	28.633636
1970	28.99125
1971	29.377198
1972	29.82715
1973	30.191538
1974	30.444105
1975	31.005731
1976	31.621514
1977	31.947994
1978	32.533925
1979	33.161065
1980	33.772738
1981	34.350886
1982	35.436126
1983	36.025302
1984	37.04275
1985	37.868451
1986	38.632914
1987	39.412121
1988	39.783382
1989	40.216012
1990	40.440528
1991	40.867408
1992	41.769689
1993	42.525377
1994	42.571779
1995	43.63339
1996	44.654149
1997	45.715661
1998	47.113157
1999	47.320667
2000	47.198677
2001	46.900772
2002	47.873784
2003	48.164078
2004	48.419284
2005	48.853018
2006	49.329524
2007	49.647565
2008	50.173289
2009	50.662507
2010	50.891193
2011	51.38325
2012	51.511744
2013	52.333598
2014	52.111054
2015	52.846531
2016	54.469137
2017	54.658362
2018	55.309617
2019	55.582646
2020	54.057416
2021	52.633923
2022	52.708505