Year	% of cohort
1960	45.979066
1961	46.185867
1962	47.397951
1963	48.078485
1964	49.044073
1965	49.703433
1966	50.446261
1967	51.046338
1968	51.978736
1969	52.673795
1970	53.33692
1971	53.926004
1972	54.894422
1973	51.981833
1974	47.138218
1975	57.48288
1976	58.406388
1977	59.249203
1978	60.08118
1979	61.032245
1980	62.001279
1981	62.777539
1982	64.010858
1983	65.094808
1984	65.959042
1985	66.022658
1986	67.303581
1987	68.316405
1988	68.588224
1989	69.61927
1990	70.323048
1991	71.246502
1992	71.585115
1993	72.115855
1994	72.413606
1995	73.401099
1996	73.889475
1997	74.13773
1998	63.259896
1999	75.205141
2000	75.497974
2001	76.357787
2002	76.495742
2003	76.57689
2004	77.480069
2005	77.42603
2006	77.592377
2007	77.541888
2008	77.561622
2009	78.486638
2010	79.07428
2011	79.970496
2012	80.671659
2013	81.23263
2014	81.382856
2015	81.973549
2016	82.039324
2017	82.142433
2018	82.285189
2019	82.285387
2020	79.862732
2021	76.968586
2022	78.305907