Year	% of cohort
1978	94.6983337402344
1979	94.2985992431641
1980	91.8963088989258
1984	97.7968521118164
1985	99.0484619140625
1991	97.8779678344727
1992	96.8026809692383
1994	99.0638580322266
1996	97.6690292358398
1997	98.0839080810547
1998	96.7789688110352
1999	99.187141418457
2000	97.6148529052734
2001	99.2581787109375
2002	97.1415100097656
2007	94.7960815429688
2008	86.2874526977539
2010	95.2831802368164
2011	93.8675384521484
2012	97.3750762939453
2013	96.60546875
2014	95.9470977783203
2018	97.132438659668
2019	98.77587890625
2020	95.2944564819336
2021	96.4613189697266