Year	% of cohort
1980	93.3637619018555
1981	94.1834869384766
1982	93.4372100830078
1983	93.9722366333008
1984	97.2213516235352
1985	95.9830474853516
1986	99.7973022460938
1989	96.6789932250977
2005	99.2837905883789
2008	99.9977416992188
2010	97.4185333251953
2011	96.5746383666992
2012	95.8031387329102
2013	96.6376113891602
2014	97.5837020874023
2015	99.3617630004883
2016	99.9814605712891
2017	100
2018	99.9479598999023
2019	99.7720336914062
2020	100