Year	% of cohort
1960	37.028159
1961	37.250864
1962	37.645288
1963	38.067761
1964	38.412446
1965	36.60717
1966	36.985637
1967	37.299909
1968	39.725549
1969	40.150305
1970	40.640229
1971	41.257245
1972	41.915444
1973	42.744805
1974	43.779715
1975	44.48953
1976	45.057271
1977	45.453656
1978	45.867827
1979	46.284924
1980	46.74036
1981	47.347524
1982	48.07729
1983	48.885426
1984	49.732602
1985	50.558339
1986	51.319213
1987	51.988605
1988	52.56644
1989	53.128656
1990	53.615218
1991	54.113338
1992	54.64526
1993	55.147384
1994	55.698067
1995	56.196341
1996	56.655517
1997	57.103661
1998	57.529499
1999	57.941784
2000	58.494297
2001	59.052275
2002	59.865553
2003	60.64381
2004	61.327803
2005	62.079166
2006	62.672855
2007	63.133693
2008	63.491706
2009	63.825923
2010	64.217354
2011	64.728118
2012	65.448685
2013	66.314398
2014	67.278181
2015	68.163456
2016	68.891082
2017	69.363242
2018	69.6327
2019	69.849344
2020	68.195827
2021	61.849965
2022	63.168279