Year	% of cohort
1995	93.5551605224609
1996	92.1627426147461
1997	86.8143615722656
1998	89.8435287475586
1999	89.7462310791016
2000	91.9266662597656
2001	90.0395278930664
2002	92.2965698242188
2003	91.2689819335938
2015	98.764518737793
2016	97.6589889526367
2017	98.5137023925781
2018	99.2967376708984