Year	% of cohort
1960	76.94985
1961	77.288624
1962	77.254723
1963	78.157052
1964	78.781611
1965	79.641544
1966	80.148438
1967	80.25348
1968	80.906348
1969	80.422335
1970	80.598377
1971	80.586034
1972	81.824314
1973	81.895553
1974	82.309501
1975	81.966459
1976	82.058823
1977	81.971178
1978	82.036889
1979	82.239054
1980	81.670337
1981	82.304629
1982	82.237752
1983	82.274759
1984	82.077888
1985	81.875832
1986	82.154865
1987	82.193592
1988	82.571782
1989	82.458354
1990	82.585916
1991	82.402567
1992	82.909416
1993	83.779233
1994	83.975045
1995	84.354874
1996	84.785438
1997	85.083278
1998	85.42564
1999	85.545825
2000	86.067248
2001	86.575466
2002	87.052879
2003	87.171205
2004	87.299359
2005	87.337673
2006	87.318265
2007	87.328756
2008	87.513144
2009	87.676002
2010	88.376554
2011	88.552542
2012	88.570275
2013	88.778635
2014	89.245028
2015	89.293134
2016	89.608008
2017	89.677933
2018	89.537207
2019	89.785609
2020	89.940198
2021	89.671039
2022	89.781126