Year	% of cohort
1960	61.92443
1961	62.471901
1962	62.976
1963	63.430396
1964	63.838002
1965	64.176771
1966	64.409303
1967	64.639846
1968	64.841638
1969	65.085314
1970	65.118113
1971	65.331916
1972	65.557475
1973	65.712199
1974	65.954115
1975	66.276387
1976	66.652462
1977	67.011092
1978	67.238185
1979	67.660391
1980	68.078678
1981	68.427894
1982	68.95599
1983	69.252613
1984	69.644428
1985	70.175795
1986	70.623259
1987	71.138541
1988	71.581359
1989	71.809289
1990	72.673791
1991	73.120739
1992	73.579576
1993	74.068689
1994	74.455436
1995	74.882373
1996	75.36182
1997	75.503519
1998	75.935943
1999	76.297766
2000	76.57717
2001	76.952853
2002	77.60766
2003	77.87478
2004	78.10258
2005	77.938125
2006	78.214369
2007	78.456369
2008	78.7572
2009	79.015904
2010	79.40356
2011	79.651143
2012	80.121659
2013	80.497419
2014	80.802701
2015	81.290154
2016	81.890072
2017	82.012859
2018	81.929564
2019	82.131791
2020	80.868378
2021	77.567
2022	77.960041