Year	% of cohort
1983	90.5755996704102
1987	85.7316436767578
1990	94.6138763427734
2000	87.1151428222656
2001	88.8835906982422
2008	87.6234512329102
2010	88.1024475097656
2012	87.5203628540039
2013	95.3927764892578
2016	94.1136932373047
2017	96.8594207763672
2018	94.5005874633789
2019	72.1055297851562