Year	% of cohort
1960	52.854696
1961	54.116649
1962	55.372244
1963	56.972157
1964	58.281124
1965	59.931899
1966	61.528584
1967	63.015515
1968	64.410426
1969	65.815727
1970	66.615108
1971	67.5839
1972	68.271727
1973	69.092379
1974	69.629669
1975	70.061147
1976	71.058676
1977	71.364168
1978	71.781522
1979	72.072727
1980	72.462253
1981	72.787924
1982	72.947697
1983	73.093773
1984	73.243846
1985	73.359879
1986	73.401212
1987	73.420004
1988	73.529868
1989	73.536539
1990	73.759512
1991	73.796816
1992	73.730758
1993	74.200625
1994	74.260962
1995	74.228145
1996	74.381847
1997	74.479133
1998	74.454989
1999	75.009925
2000	75.203484
2001	75.884001
2002	76.801396
2003	77.159355
2004	77.737794
2005	77.467203
2006	77.147339
2007	77.503245
2008	77.727665
2009	78.043193
2010	78.161358
2011	78.503223
2012	78.784542
2013	79.04739
2014	79.448309
2015	79.924921
2016	80.386605
2017	80.772774
2018	81.258541
2019	81.73869
2020	82.169251
2021	82.547256
2022	82.335097