Year	% of cohort
1978	92.5873184204102
1980	91.8963088989258
1991	97.6371688842773
1992	96.8026809692383
1994	99.0638580322266
1996	97.6690292358398
1997	98.0839080810547
1998	96.7789688110352
2000	97.5658187866211
2001	99.2581787109375
2002	96.9396209716797
2007	92.903938293457
2008	83.4733276367188
2010	95.2831802368164
2011	93.8216781616211
2012	96.953498840332
2013	95.8724670410156
2014	94.8244094848633
2018	96.6082305908203
2019	98.77587890625
2020	94.9774398803711
2021	95.6406478881836