Year	% of cohort
1975	84.9590072631836
1976	85.517219543457
1977	67.486198425293
1986	97.3619918823242
1999	99.1244964599609
2000	98.9977188110352
2001	94.9990081787109
2002	96.0857086181641
2003	98.6022720336914
2004	93.5188674926758
2005	94.3657684326172
2006	94.3875122070312
2009	97.2372894287109
2016	97.3792495727539
2017	97.6362686157227
2018	99.3827667236328
2019	99.7280807495117
2020	99.8412170410156