Year	% of cohort
1960	68.776307
1961	69.388315
1962	69.070947
1963	69.080278
1964	70.125942
1965	70.861397
1966	71.247257
1967	71.249363
1968	72.020708
1969	70.822041
1970	72.498154
1971	71.582147
1972	73.748339
1973	73.174069
1974	73.71851
1975	74.029575
1976	74.515317
1977	75.217793
1978	75.324432
1979	75.875153
1980	76.77711
1981	77.04301
1982	77.881058
1983	77.680725
1984	77.844318
1985	77.752659
1986	78.18953
1987	78.407863
1988	78.235645
1989	78.077705
1990	78.163556
1991	78.085244
1992	78.462468
1993	79.018135
1994	79.519642
1995	79.561527
1996	79.863814
1997	81.038935
1998	81.450744
1999	81.466938
2000	81.978489
2001	82.298737
2002	82.541117
2003	82.707109
2004	83.462402
2005	83.678785
2006	84.174738
2007	84.497681
2008	85.013008
2009	85.601552
2010	86.053854
2011	86.393569
2012	86.680864
2013	87.151007
2014	87.414648
2015	87.479326
2016	87.73517
2017	88.033967
2018	87.996089
2019	88.415084
2020	87.547557
2021	87.819924
2022	88.88725