Year	% of cohort
1960	67.874361
1961	68.584359
1962	69.078475
1963	68.751745
1964	69.090403
1965	69.693568
1966	69.728815
1967	70.191504
1968	70.727401
1969	71.277314
1970	71.475097
1971	72.089018
1972	72.723636
1973	72.766463
1974	72.990625
1975	72.978372
1976	73.304602
1977	73.822139
1978	74.278738
1979	74.805543
1980	74.638281
1981	75.411205
1982	75.884952
1983	76.523741
1984	76.743425
1985	76.965441
1986	77.52534
1987	76.975733
1988	47.876239
1989	78.485724
1990	78.655347
1991	78.853385
1992	79.284897
1993	79.725181
1994	80.114344
1995	80.219006
1996	81.054975
1997	80.585311
1998	81.661886
1999	81.225733
2000	81.760427
2001	82.35485
2002	82.493791
2003	83.415087
2004	83.036557
2005	83.961157
2006	84.279666
2007	84.707918
2008	85.050762
2009	85.797695
2010	86.16806
2011	86.521892
2012	86.27054
2013	86.833774
2014	87.583172
2015	87.99091
2016	88.44443
2017	88.682591
2018	88.967844
2019	89.283305
2020	84.736793
2021	85.137742
2022	86.906347