Year	% of cohort
1991	65.4380264282227
1994	67.3477020263672
1995	70.035888671875
1999	73.9957962036133
2000	83.5991668701172
2005	90.6781921386719
2006	83.9840393066406
2007	89.8652877807617
2008	94.7290802001953
2009	90.2656402587891
2010	90.9166107177734
2012	90.9105377197266
2013	94.6714401245117
2014	98.7834396362305
2016	93.0004425048828
2017	95.7903213500977
2019	90.1787490844727
2020	96.2884063720703