Year	% of cohort
1960	80.064996
1961	80.071838
1962	78.560449
1963	79.875168
1964	81.700542
1965	80.982225
1966	80.877602
1967	80.392746
1968	80.66457
1969	80.354498
1970	80.120756
1971	80.890261
1972	80.725921
1973	80.365731
1974	80.936896
1975	80.157333
1976	80.350095
1977	79.960979
1978	80.072369
1979	79.894301
1980	80.070757
1981	80.478558
1982	81.062076
1983	80.545927
1984	80.272322
1985	79.377384
1986	81.087908
1987	80.883997
1988	81.272774
1989	81.761442
1990	80.773349
1991	81.07495
1992	81.095188
1993	80.00221
1994	79.187214
1995	79.876806
1996	81.603725
1997	81.610766
1998	81.357102
1999	82.246855
2000	82.785609
2001	82.519632
2002	82.935035
2003	82.658255
2004	83.094745
2005	83.21844
2006	83.141667
2007	82.923512
2008	84.215751
2009	84.61584
2010	84.826366
2011	85.647987
2012	85.493924
2013	85.831787
2014	86.459549
2015	86.505193
2016	86.620413
2017	86.760123
2018	86.955877
2019	87.396052
2020	87.446812
2021	85.461941
2022	87.74441