Year	% of cohort
1993	95.6405487060547
1998	97.1182632446289
1999	96.377067565918
2000	96.6135025024414
2001	98.6945571899414
2005	97.5513229370117
2006	97.3085479736328
2007	96.2170028686523
2008	97.4964065551758
2009	97.3521499633789
2010	97.7131729125977
2011	97.6171264648438
2012	99.4709167480469
2013	97.9401168823242
2014	68.2617492675781
2015	95.3192367553711
2016	97.9927597045898
2017	98.5242309570312
2018	99.0180587768555
2019	98.1371994018555
2020	99.4861831665039