Year	% of cohort
1979	97.6405868530273
1980	99.0416412353516
1981	98.4838790893555
1982	99.4977722167969
1983	99.431022644043
1984	98.7714462280273
1985	100
1988	100
1989	99.9134521484375
1990	98.5173492431641
1991	99.8390808105469
1992	99.6642074584961
1993	99.8834075927734
1994	100
1995	100
2002	99.563850402832
2003	99.6220779418945
2004	99.5038528442383
2007	99.6594009399414
2008	99.6791229248047
2009	99.4670715332031
2010	99.7745513916016
2011	99.6433715820312
2012	99.8373031616211
2013	99.508171081543
2014	99.3027801513672
2015	99.2695388793945
2016	99.4370498657227
2017	99.2122421264648
2018	98.2984771728516
2019	98.9976577758789
2020	90.9600296020508
2021	85.6163864135742