Year	% of cohort
1972	79.5342636108398
1973	71.8596496582031
1975	73.9870071411133
1976	84.7786636352539
1977	87.7867279052734
1978	87.8147735595703
1979	86.6922607421875
1980	87.8013763427734
1982	78.820930480957
1983	71.7840728759766
1984	67.6740188598633
1985	68.6828765869141
1986	68.3212127685547
1987	72.1625671386719
1988	75.2851409912109
1989	70.2550582885742
1990	62.2714004516602
1991	70.182861328125
1992	57.2586708068848
1993	81.7705764770508
1994	70.6103591918945
1995	67.9784698486328
1996	68.0547485351562
1997	68.487907409668
1999	64.9680786132812
2000	87.8549423217773
2006	73.1178283691406
2008	66.0399627685547
2011	85.3311614990234
2012	77.6316299438477
2013	74.1188201904297
2014	82.4631271362305
2015	84.06640625
2019	80.5099792480469
2020	78.8362808227539
2021	69.9671173095703