Year	% of cohort
1960	67.851759
1961	68.151796
1962	67.941911
1963	69.433092
1964	69.541121
1965	70.239314
1966	71.071871
1967	71.252295
1968	71.006605
1969	71.131294
1970	71.831432
1971	71.884496
1972	72.297692
1973	73.035833
1974	73.36272
1975	73.597919
1976	73.844818
1977	73.559425
1978	73.807505
1979	74.029764
1980	74.88359
1981	75.664682
1982	76.110742
1983	75.723863
1984	76.135386
1985	76.390332
1986	76.739842
1987	77.322239
1988	77.829404
1989	79.20129
1990	79.560658
1991	79.529053
1992	79.328337
1993	78.751352
1994	78.539439
1995	78.258436
1996	78.567272
1997	77.988686
1998	77.876352
1999	77.998516
2000	77.924666
2001	77.781061
2002	78.604057
2003	78.749556
2004	79.347011
2005	79.611127
2006	79.713298
2007	79.509536
2008	79.278953
2009	80.301343
2010	81.220188
2011	81.836522
2012	81.453809
2013	80.964389
2014	80.327318
2015	79.849107
2016	79.715625
2017	79.680069
2018	79.648067
2019	79.578964
2020	79.625591
2021	77.216714
2022	77.600209