Year	% of cohort
1960	62.356451
1961	63.202843
1962	63.542497
1963	64.354483
1964	65.664653
1965	67.110349
1966	67.743783
1967	68.752961
1968	69.763555
1969	71.384617
1970	71.646475
1971	73.291071
1972	73.827756
1973	75.623528
1974	76.723086
1975	77.827225
1976	78.984435
1977	80.59806
1978	81.707707
1979	81.944167
1980	82.828294
1981	83.106473
1982	84.642017
1983	84.869649
1984	85.189831
1985	85.489818
1986	85.888874
1987	86.24615
1988	86.800782
1989	87.335825
1990	87.642119
1991	87.355938
1992	87.645295
1993	87.839685
1994	87.958195
1995	88.088741
1996	88.166326
1997	88.851634
1998	88.437181
1999	88.954907
2000	89.264103
2001	89.123646
2002	89.604109
2003	89.641933
2004	89.851981
2005	90.065686
2006	90.240814
2007	90.08397
2008	90.122441
2009	90.269294
2010	90.080536
2011	90.626322
2012	90.502666
2013	90.616504
2014	90.128151
2015	90.421252
2016	90.822178
2017	90.612662
2018	90.956925
2019	90.916154
2020	91.045333
2021	88.823757
2022	89.041916