Year	% of cohort
1960	61.198663
1961	57.420986
1962	54.565884
1963	59.008742
1964	62.923483
1965	62.346447
1966	52.855798
1967	60.561663
1968	61.270682
1969	60.22132
1970	60.996432
1971	61.071906
1972	64.040874
1973	67.97495
1974	69.814179
1975	69.610767
1976	67.951192
1977	67.911825
1978	69.378083
1979	70.599149
1980	70.793149
1981	70.389662
1982	70.50732
1983	71.034591
1984	72.743687
1985	71.151755
1986	69.569603
1987	70.33733
1988	71.578469
1989	71.370747
1990	71.888649
1991	72.725673
1992	73.43377
1993	72.397532
1994	73.419693
1995	76.114
1996	78.642324
1997	78.762404
1998	80.589185
1999	80.258858
2000	80.810837
2001	81.857691
2002	84.376345
2003	83.054692
2004	82.997413
2005	80.029323
2006	79.561368
2007	80.725209
2008	81.258779
2009	82.326851
2010	81.6066
2011	83.017776
2012	82.545962
2013	81.977851
2014	82.792643
2015	83.384923
2016	82.909731
2017	85.025184
2018	84.436174
2019	84.826671
2020	84.991378
2021	80.585566
2022	85.613712