Year	% of cohort
1960	31.201363
1961	31.718533
1962	32.15529
1963	33.465923
1964	34.060516
1965	34.789354
1966	35.765047
1967	36.450825
1968	37.530647
1969	38.392986
1970	39.503073
1971	39.915071
1972	40.943788
1973	42.137169
1974	43.170559
1975	43.995704
1976	44.898669
1977	45.521637
1978	46.289937
1979	46.94433
1980	47.718844
1981	48.112781
1982	48.53631
1983	48.854662
1984	49.070521
1985	49.431422
1986	49.323558
1987	49.717706
1988	49.906886
1989	50.318192
1990	50.457469
1991	50.838886
1992	51.330251
1993	52.009533
1994	52.413478
1995	53.034723
1996	53.046636
1997	53.69653
1998	52.594368
1999	54.311077
2000	54.419625
2001	54.379198
2002	53.965413
2003	54.012912
2004	53.51114
2005	53.692326
2006	54.186786
2007	54.590787
2008	54.958492
2009	55.178409
2010	55.793401
2011	56.14189
2012	56.295867
2013	56.515048
2014	57.083692
2015	57.414668
2016	57.603438
2017	58.286322
2018	58.32391
2019	58.357812
2020	59.275298
2021	57.706962
2022	59.08303