Year	% of cohort
1960	74.501726
1961	68.220924
1962	69.646321
1963	64.667949
1964	74.693458
1965	75.476278
1966	68.725122
1967	79.379699
1968	78.898703
1969	79.281727
1970	82.524846
1971	79.837005
1972	82.45659
1973	84.237297
1974	84.989907
1975	84.843098
1976	84.556309
1977	85.362758
1978	86.002504
1979	86.272892
1980	87.250496
1981	86.889941
1982	87.730455
1983	88.272347
1984	86.78894
1985	85.226306
1986	86.28514
1987	86.721544
1988	87.157373
1989	86.03606
1990	86.890505
1991	86.85469
1992	84.396974
1993	86.19725
1994	85.003669
1995	88.08298
1996	89.328468
1997	88.461578
1998	88.793674
1999	89.469174
2000	89.902703
2001	90.383015
2002	89.940221
2003	89.821775
2004	91.837822
2005	91.147661
2006	91.519504
2007	92.483165
2008	91.62485
2009	91.353478
2010	92.391348
2011	93.024579
2012	93.276465
2013	93.144106
2014	92.66302
2015	93.02734
2016	92.282797
2017	92.394162
2018	92.664782
2019	92.986129
2020	93.131362
2021	90.589703
2022	92.356583