Year	% of cohort
1960	41.395074
1961	42.075895
1962	43.105794
1963	44.197693
1964	45.322493
1965	46.380798
1966	47.553166
1967	48.627156
1968	50.279983
1969	51.809109
1970	53.358066
1971	54.975289
1972	56.46278
1973	58.029105
1974	59.639589
1975	56.929536
1976	62.68778
1977	62.892329
1978	65.082523
1979	66.176594
1980	66.985987
1981	67.77459
1982	68.450107
1983	68.932557
1984	69.338121
1985	69.894831
1986	68.478152
1987	70.595897
1988	70.851333
1989	71.108187
1990	71.356201
1991	71.50916
1992	71.712067
1993	71.890068
1994	72.183154
1995	72.401513
1996	72.605171
1997	72.801561
1998	72.984049
1999	73.162722
2000	73.32071
2001	73.468802
2002	73.585916
2003	73.718281
2004	73.869955
2005	74.005983
2006	74.161215
2007	73.725707
2008	74.479759
2009	74.515155
2010	74.842139
2011	75.073313
2012	75.281252
2013	75.332254
2014	75.421996
2015	75.861323
2016	76.199215
2017	76.469517
2018	76.757944
2019	77.042495
2020	76.907755
2021	77.010612
2022	77.809624