Year	% of cohort
1975	87.4101028442383
1976	88.3359680175781
1999	98.8056182861328
2000	98.7760696411133
2001	94.7705383300781
2002	94.2822265625
2003	98.2610397338867
2005	94.0034484863281
2009	96.7723693847656
2016	96.9304122924805
2018	99.0363922119141
2019	99.4990692138672
2020	99.6903991699219