Year	% of cohort
1993	98.0074691772461
1995	97.5108184814453
1996	97.7634124755859
1998	88.898681640625
1999	98.9703674316406
2000	98.6744613647461
2001	96.2717819213867
2002	97.7882614135742
2004	99.8350067138672
2005	98.5175704956055
2006	99.07763671875
2007	96.1806793212891
2010	96.8779525756836
2011	98.8017501831055
2012	99.0531234741211
2013	98.4635696411133
2014	98.2686767578125
2015	98.0649719238281
2016	98.1209716796875
2017	97.8286437988281
2018	98.4112014770508
2019	98.0045623779297
2020	97.779899597168
2021	99.3850784301758