Year	% of cohort
1979	88.8403091430664
1980	88.2861709594727
1983	90.4014129638672
1984	87.6632919311523
1985	88.4411163330078
1991	81.1838531494141
1994	79.0471420288086
1995	81.8002624511719
1996	86.2678527832031
1997	84.0918807983398
1998	83.9768676757812
1999	82.238166809082
2000	81.8517990112305
2001	78.6448974609375
2003	93.924919128418
2008	93.4308471679688
2011	95.021842956543
2012	97.951530456543
2015	90.0130310058594
2019	73.4908065795898