Year	% of cohort
1960	80.619565
1961	81.220354
1962	81.017359
1963	81.158174
1964	81.667682
1965	81.855963
1966	82.034896
1967	82.193804
1968	82.49352
1969	82.587956
1970	82.900937
1971	83.529901
1972	83.246395
1973	83.48849
1974	83.698291
1975	84.019607
1976	84.745233
1977	84.836742
1978	85.254585
1979	85.437436
1980	85.85517
1981	86.120366
1982	86.577729
1983	87.085637
1984	87.271115
1985	87.239623
1986	87.521801
1987	87.659817
1988	87.913607
1989	88.123955
1990	88.472654
1991	88.585836
1992	88.676957
1993	88.742698
1994	88.819928
1995	89.026196
1996	89.187298
1997	89.448994
1998	89.627142
1999	89.852381
2000	89.979998
2001	90.25759
2002	90.106167
2003	90.273003
2004	90.515313
2005	90.547006
2006	90.854368
2007	90.893478
2008	90.941643
2009	91.052682
2010	91.406586
2011	91.513544
2012	91.474252
2013	91.655561
2014	91.583078
2015	91.621565
2016	91.594127
2017	91.722363
2018	91.83623
2019	92.046647
2020	91.972007
2021	92.558089
2022	92.395711