Year	% of cohort
1980	92.3999633789062
1981	94.8775024414062
1982	92.8553924560547
1983	93.1635665893555
1984	95.7236328125
1985	95.066650390625
1986	94.0696334838867
1989	97.2135314941406
2005	99.5167007446289
2008	98.9618377685547
2010	98.0782470703125
2011	97.6953582763672
2012	96.0721435546875
2013	96.0520629882812
2014	97.3051376342773
2015	99.1996765136719
2016	99.7712783813477
2017	99.5204162597656
2018	99.7252731323242
2019	99.7865982055664
2020	99.7760925292969