Year	% of cohort
1975	82.9800872802734
2003	99.014518737793
2004	97.8345718383789
2005	97.7942276000977
2006	97.411979675293
2007	97.8608703613281
2009	96.9066619873047
2011	99.7469863891602
2016	96.1130676269531
2018	96.5889663696289
2019	98.8589477539062