Year	% of cohort
1960	55.290657
1961	55.136539
1962	55.837664
1963	56.051273
1964	56.05741
1965	56.459398
1966	56.681007
1967	57.066422
1968	57.362363
1969	57.053617
1970	57.574663
1971	57.715813
1972	57.411611
1973	57.976455
1974	61.516574
1975	60.324452
1976	58.202535
1977	59.752306
1978	62.291018
1979	61.746317
1980	61.857649
1981	62.188329
1982	60.951351
1983	62.456168
1984	61.593437
1985	61.495133
1986	63.445796
1987	62.650372
1988	64.148533
1989	63.540296
1990	64.362964
1991	64.85071
1992	64.166669
1993	64.996788
1994	63.680584
1995	65.693257
1996	64.53494
1997	65.338904
1998	65.217334
1999	64.3427
2000	65.131651
2001	65.767875
2002	66.537866
2003	65.310939
2004	67.268439
2005	67.345326
2006	67.93414
2007	68.316576
2008	67.325503
2009	69.691061
2010	69.125783
2011	70.405109
2012	71.24029
2013	71.335267
2014	71.472173
2015	71.503182
2016	71.040692
2017	70.714019
2018	69.689587
2019	70.583245
2020	71.086429
2021	68.98339
2022	71.631935