Year	% of cohort
1960	59.905617
1961	49.420645
1962	60.784278
1963	61.600368
1964	61.987754
1965	62.543966
1966	63.194585
1967	64.315919
1968	65.001854
1969	65.875027
1970	67.092659
1971	67.443556
1972	67.780713
1973	68.902434
1974	69.088483
1975	70.267086
1976	71.476794
1977	72.206689
1978	72.525753
1979	73.197746
1980	73.407062
1981	73.705194
1982	73.157476
1983	73.868948
1984	75.354906
1985	75.557721
1986	76.807788
1987	77.571136
1988	78.260743
1989	78.622924
1990	78.091975
1991	77.156778
1992	76.360232
1993	76.545357
1994	77.799259
1995	76.912632
1996	77.119418
1997	75.794558
1998	74.69655
1999	75.122417
2000	74.718137
2001	74.373566
2002	75.224574
2003	75.211351
2004	75.47615
2005	75.281078
2006	76.795092
2007	77.873981
2008	78.699588
2009	79.92774
2010	80.675869
2011	81.141991
2012	81.832737
2013	82.102676
2014	82.327959
2015	82.557952
2016	82.83318
2017	83.073664
2018	83.313043
2019	83.648442
2020	80.282876
2021	76.963548
2022	78.216826