Year	% of cohort
1974	93.1429061889648
1980	83.2058410644531
1981	76.85302734375
1982	88.2174987792969
1983	81.2548980712891
1985	79.7299880981445
1986	71.1274490356445
1987	66.8671035766602
1988	71.5976486206055
1990	71.0477828979492
1991	74.7447814941406
1992	75.4123687744141
1993	67.5419006347656
1996	68.2105178833008
1997	63.0765800476074
1998	70.5104293823242
1999	69.3305435180664
2000	71.3798217773438
2001	92.0427627563477
2003	78.8867874145508
2004	81.489372253418
2005	77.586799621582
2006	80.462760925293
2008	71.1538009643555
2009	76.4243774414062
2012	57.8441505432129
2017	90.3415603637695
2018	82.3947906494141
2019	74.6182022094727