Year	% of cohort
1960	79.061573
1961	79.23676
1962	77.341633
1963	79.828979
1964	81.326932
1965	80.511941
1966	81.001757
1967	81.418573
1968	81.006109
1969	80.741452
1970	80.763896
1971	82.202646
1972	81.427234
1973	81.919497
1974	82.205325
1975	81.898355
1976	82.224174
1977	82.24792
1978	82.157314
1979	82.335383
1980	82.218117
1981	82.669681
1982	83.418055
1983	82.992128
1984	82.350976
1985	82.233305
1986	83.482481
1987	83.270963
1988	83.333631
1989	83.70791
1990	83.353718
1991	83.388248
1992	83.496957
1993	82.077113
1994	82.270387
1995	82.421129
1996	83.353376
1997	83.778556
1998	83.890965
1999	84.370303
2000	84.892039
2001	84.951609
2002	84.750963
2003	85.133067
2004	85.011093
2005	84.647178
2006	84.338252
2007	84.613397
2008	84.922692
2009	85.650511
2010	85.694852
2011	86.235917
2012	86.437054
2013	86.460403
2014	86.950071
2015	86.670272
2016	87.057775
2017	87.316436
2018	87.634943
2019	88.332767
2020	87.483636
2021	86.297283
2022	86.698307