Year	% of cohort
1980	92.8687362670898
1981	94.5349197387695
1982	93.1341934204102
1983	93.5557479858398
1984	96.4483337402344
1985	95.5106735229492
1986	96.8249282836914
1987	92.8639297485352
1988	96.2154388427734
1989	96.9541778564453
2005	99.4472503662109
2008	99.6852798461914
2009	95.4436721801758
2010	98.6053466796875
2011	98.1508636474609
2012	97.4578475952148
2013	97.6927032470703
2014	98.3961334228516
2015	99.326530456543
2016	99.9279708862305
2017	99.8460998535156
2018	99.8514785766602
2019	99.8394393920898
2020	99.8882522583008