Year	% of cohort
1960	75.635917
1961	72.795666
1962	74.282085
1963	72.235275
1964	72.71061
1965	74.153158
1966	71.937061
1967	72.654155
1968	74.049232
1969	72.86889
1970	72.506438
1971	72.092166
1972	74.114133
1973	73.702088
1974	73.455113
1975	75.50258
1976	77.468717
1977	77.094196
1978	78.194793
1979	78.045292
1980	77.518103
1981	77.190437
1982	79.164143
1983	77.753418
1984	80.493198
1985	80.393776
1986	81.702729
1987	80.74825
1988	80.601288
1989	82.615651
1990	82.739244
1991	81.760576
1992	84.415227
1993	84.987087
1994	85.101972
1995	84.285344
1996	84.550814
1997	84.904357
1998	86.080316
1999	86.047746
2000	87.211182
2001	87.491677
2002	87.82233
2003	88.525163
2004	88.04053
2005	88.618234
2006	88.870284
2007	88.776115
2008	89.275554
2009	89.083415
2010	89.044189
2011	89.8805
2012	90.566525
2013	89.574968
2014	90.072218
2015	90.125302
2016	89.234867
2017	90.087464
2018	90.14311
2019	89.70245
2020	90.285959
2021	90.577255
2022	90.473112