Year	% of cohort
1971	94.7933502197266
1972	94.2539825439453
1997	96.3759689331055
1998	97.075439453125
2003	97.7629318237305
2010	99.4116592407227
2011	99.737663269043
2012	99.609489440918
2013	99.4961700439453
2014	99.4277496337891
2015	99.5509185791016
2017	99.6081390380859
2018	99.7737884521484
2019	99.6143493652344
2020	99.708381652832
2021	99.4324493408203