Year	% of cohort
1960	68.300818
1961	69.991938
1962	70.916176
1963	71.903981
1964	72.333491
1965	73.13528
1966	73.876606
1967	74.46163
1968	74.850785
1969	75.255934
1970	74.875456
1971	75.252863
1972	75.837938
1973	76.081952
1974	76.312142
1975	76.904369
1976	77.528082
1977	78.63916
1978	79.413269
1979	80.024021
1980	80.712233
1981	80.935777
1982	81.681082
1983	81.698329
1984	81.780478
1985	81.714653
1986	81.770849
1987	82.063226
1988	82.383392
1989	82.391799
1990	82.435075
1991	82.756776
1992	82.991037
1993	83.526947
1994	83.654945
1995	83.880812
1996	84.029809
1997	84.023219
1998	84.331041
1999	84.539392
2000	84.093736
2001	83.97667
2002	84.120838
2003	84.443617
2004	84.871314
2005	85.026356
2006	85.062214
2007	85.424258
2008	85.673099
2009	86.039609
2010	85.902496
2011	86.097673
2012	86.278514
2013	86.517847
2014	86.711541
2015	86.881305
2016	87.056419
2017	87.216083
2018	87.422863
2019	87.597616
2020	87.729218
2021	87.913897
2022	88.191229