Year	% of cohort
1960	54.304669
1961	54.774042
1962	54.706116
1963	54.311561
1964	55.700022
1965	55.83794
1966	55.904923
1967	55.97576
1968	57.228728
1969	57.293062
1970	57.183591
1971	57.185294
1972	58.401718
1973	59.643095
1974	60.083331
1975	60.473555
1976	60.925687
1977	61.365534
1978	61.711976
1979	62.045003
1980	62.349447
1981	62.60858
1982	63.865021
1983	64.344426
1984	64.670486
1985	65.068102
1986	65.472616
1987	65.808562
1988	67.05372
1989	67.537713
1990	67.955884
1991	68.206171
1992	68.583169
1993	68.903544
1994	69.167126
1995	69.246375
1996	69.703338
1997	68.54022
1998	69.048454
1999	68.767069
2000	69.476231
2001	70.062055
2002	70.840721
2003	71.26499
2004	71.288296
2005	71.782894
2006	70.578442
2007	69.39835
2008	69.641993
2009	69.67057
2010	70.074771
2011	70.705162
2012	70.487515
2013	70.417168
2014	70.34392
2015	71.514785
2016	71.564907
2017	71.004032
2018	71.127658
2019	71.089708
2020	70.905954
2021	70.454289
2022	71.144528