Year	% of cohort
1978	95.0364990234375
1980	90.6915512084961
1991	99.2803192138672
1992	98.2190170288086
1994	87.3096466064453
1996	98.1678771972656
1997	95.3753128051758
1998	97.4975814819336
2000	98.3231582641602
2001	97.1599731445312
2002	97.8589401245117
2007	96.995849609375
2008	75.8309631347656
2010	96.3741989135742
2011	95.0026473999023
2012	99.6641235351562
2013	97.912483215332
2014	98.4785537719727
2018	97.7956466674805
2019	97.2776794433594
2020	97.1949462890625
2021	97.0956115722656