Year	% of cohort
1991	68.8588180541992
1994	70.3338928222656
1999	74.4934005737305
2005	89.5498886108398
2006	87.0419769287109
2007	92.8963317871094
2008	95.0305786132812
2009	89.2207717895508
2010	94.2913970947266
2012	93.5614776611328
2013	97.7053375244141
2014	98.5314331054688
2016	92.6686019897461
2017	96.3083267211914
2019	96.0347137451172
2020	96.7920913696289