Year	% of cohort
1960	71.537046
1961	72.324021
1962	72.795747
1963	73.475921
1964	73.750532
1965	74.178315
1966	74.928096
1967	75.53621
1968	76.150514
1969	76.872356
1970	77.559107
1971	78.188884
1972	79.389007
1973	80.4374
1974	81.046821
1975	81.583104
1976	81.768488
1977	81.921606
1978	82.050877
1979	82.242029
1980	82.365429
1981	83.035225
1982	83.327866
1983	83.613943
1984	83.82331
1985	84.102829
1986	84.23867
1987	84.229298
1988	84.24497
1989	84.314742
1990	84.405175
1991	84.367982
1992	84.442197
1993	84.520353
1994	84.59563
1995	84.767531
1996	84.856665
1997	84.829505
1998	84.900856
1999	85.060887
2000	85.125912
2001	85.198948
2002	85.325168
2003	85.301907
2004	85.267086
2005	85.434331
2006	85.431315
2007	85.363252
2008	85.977124
2009	86.527675
2010	87.981942
2011	88.038063
2012	88.081461
2013	88.374219
2014	88.272603
2015	88.398779
2016	88.316514
2017	88.720346
2018	88.851646
2019	89.079338
2020	88.536413
2021	86.845804
2022	87.367715