Year	% of cohort
2002	95.9348068237305
2003	96.182746887207
2004	98.6285781860352
2005	98.8852920532227
2006	98.0146102905273
2009	96.3007965087891
2010	95.9867401123047
2011	94.2086563110352
2013	90.0380401611328
2014	99.9131011962891
2015	94.889030456543
2016	94.0771484375
2017	95.165283203125
2018	94.9649505615234
2019	99.3733215332031
2020	99.4658889770508
2021	97.069450378418