Year	% of cohort
1960	68.272315
1961	67.817327
1962	67.898122
1963	67.586499
1964	68.662483
1965	68.691705
1966	68.770521
1967	70.012966
1968	69.607479
1969	69.071293
1970	69.639755
1971	70.399919
1972	70.047539
1973	70.402586
1974	70.82889
1975	71.430803
1976	71.361109
1977	72.178997
1978	72.031318
1979	72.226453
1980	73.071209
1981	73.798924
1982	74.324526
1983	74.684542
1984	75.283261
1985	75.542492
1986	75.919189
1987	76.655888
1988	76.96071
1989	77.760242
1990	78.178686
1991	78.739312
1992	79.406232
1993	79.52292
1994	80.403273
1995	80.437064
1996	80.816037
1997	81.439714
1998	81.566036
1999	81.935605
2000	82.510208
2001	82.87486
2002	83.045765
2003	83.314375
2004	84.030553
2005	84.366557
2006	84.347087
2007	84.683433
2008	84.952265
2009	85.431861
2010	85.821332
2011	86.337023
2012	86.75407
2013	86.61181
2014	86.813811
2015	86.663826
2016	86.653361
2017	86.812113
2018	86.639493
2019	87.25462
2020	85.250719
2021	84.929711
2022	88.073559