Year	% of cohort
1960	51.119662
1961	51.851277
1962	50.890705
1963	47.357914
1964	48.496518
1965	46.67923
1966	46.001411
1967	45.182498
1968	36.211419
1969	40.30299
1970	40.303826
1971	41.232282
1972	33.948255
1973	41.21044
1974	38.806341
1975	53.889286
1976	58.414347
1977	58.836555
1978	59.331363
1979	60.455842
1980	60.796394
1981	61.972488
1982	62.334809
1983	62.31844
1984	62.519565
1985	63.376929
1986	63.464456
1987	64.427133
1988	64.241273
1989	65.004932
1990	65.015372
1991	65.86653
1992	65.815039
1993	66.657952
1994	66.677006
1995	67.624659
1996	67.750927
1997	68.618919
1998	68.894315
1999	69.092102
2000	69.341048
2001	69.592943
2002	69.748606
2003	69.975951
2004	70.152609
2005	70.485403
2006	70.519101
2007	70.659791
2008	70.515865
2009	70.762471
2010	70.805396
2011	71.166272
2012	71.19133
2013	71.348633
2014	71.446922
2015	71.42314
2016	71.466982
2017	71.620989
2018	71.5794
2019	71.804559
2020	74.778522
2021	71.887031
2022	72.68571