Year	% of cohort
1978	95.0364990234375
1979	90.8682022094727
1980	92.0399017333984
1984	95.1547470092773
1985	96.8702011108398
1991	99.2803192138672
1992	98.7769393920898
1994	89.6672821044922
1996	98.4659118652344
1997	97.1200103759766
1998	97.847282409668
1999	98.0006637573242
2000	98.3231582641602
2001	99.4207077026367
2002	98.2564468383789
2007	96.995849609375
2008	80.5369720458984
2010	98.0252685546875
2011	97.2863693237305
2012	99.6641235351562
2013	97.912483215332
2014	98.4785537719727
2018	97.7956466674805
2019	99.0468902587891
2020	97.1949462890625
2021	97.0956115722656