Year	% of cohort
1991	65.919059753418
1994	70.531379699707
1999	77.7948303222656
2005	92.6188507080078
2006	87.6295318603516
2007	92.514762878418
2008	96.1940307617188
2009	93.0867691040039
2010	89.6096878051758
2012	93.5910568237305
2013	95.1149063110352
2014	99.7655181884766
2016	97.0621566772461
2017	96.3066101074219
2019	89.94287109375
2020	96.8570327758789