Year	% of cohort
1960	43.248266
1961	45.84205
1962	48.030691
1963	50.215442
1964	52.077283
1965	54.282112
1966	56.375414
1967	58.44154
1968	60.446717
1969	62.609535
1970	63.809648
1971	65.707481
1972	66.844286
1973	68.129919
1974	69.274827
1975	70.110061
1976	71.206417
1977	72.235474
1978	72.50267
1979	73.570745
1980	73.911421
1981	74.769319
1982	74.982058
1983	75.299512
1984	76.25451
1985	76.380798
1986	76.713952
1987	76.934629
1988	77.151171
1989	77.290367
1990	77.385625
1991	77.835473
1992	77.88202
1993	78.82877
1994	78.633009
1995	78.83554
1996	79.43196
1997	79.244782
1998	79.015275
1999	79.962701
2000	80.639037
2001	81.744027
2002	81.960392
2003	82.677625
2004	83.000012
2005	83.597067
2006	83.98155
2007	84.794951
2008	85.849456
2009	86.72269
2010	87.43773
2011	87.576268
2012	87.802783
2013	87.92342
2014	88.028713
2015	88.264105
2016	88.462844
2017	88.711875
2018	89.03996
2019	89.279293
2020	88.873736
2021	88.530469
2022	88.975244