Year	% of cohort
1975	79.1304779052734
1976	83.9284515380859
1986	95.3754119873047
1999	99.1244964599609
2000	98.9977188110352
2001	94.9990081787109
2002	96.0857086181641
2003	98.6022720336914
2004	93.5188674926758
2005	93.1775283813477
2006	93.9118576049805
2009	96.0976867675781
2016	96.4185104370117
2017	97.0192718505859
2018	99.0093002319336
2019	99.6419219970703
2020	99.7528686523438