Year	% of cohort
1960	40.518577
1961	40.928861
1962	41.202476
1963	41.407619
1964	41.714846
1965	42.049916
1966	42.11862
1967	42.211031
1968	42.475675
1969	42.829912
1970	43.309801
1971	43.717356
1972	43.968879
1973	44.661203
1974	45.081924
1975	45.48897
1976	46.167386
1977	46.727713
1978	47.321484
1979	47.831501
1980	48.397953
1981	49.033096
1982	49.896753
1983	50.538521
1984	51.268712
1985	51.902758
1986	52.419452
1987	52.388268
1988	52.21352
1989	51.843024
1990	51.096366
1991	49.748456
1992	49.738279
1993	48.583728
1994	47.901037
1995	47.420222
1996	45.725013
1997	44.769721
1998	43.52439
1999	42.334895
2000	40.960599
2001	39.400071
2002	36.946401
2003	34.554212
2004	34.378069
2005	34.273197
2006	34.302871
2007	34.821405
2008	36.277238
2009	37.854353
2010	40.235784
2011	42.701555
2012	45.16115
2013	46.145646
2014	47.560248
2015	48.639388
2016	50.001637
2017	51.112129
2018	51.826009
2019	53.687107
2020	51.766718
2021	46.18486
2022	44.233683