Year	% of cohort
1996	91.6197814941406
1997	91.5325317382812
1998	91.7339782714844
1999	91.6963119506836
2000	91.7274780273438
2001	91.671012878418
2002	91.7128067016602
2003	91.7372131347656
2004	91.7068176269531
2005	91.8886108398438
2006	91.7387237548828
2007	91.8541107177734
2008	91.5129776000977
2009	91.5791473388672
2010	91.6239166259766
2011	91.7559585571289
2012	91.8332595825195
2013	91.6754379272461
2014	91.72509765625
2015	91.7465896606445
2016	91.7398071289062
2017	91.813720703125
2018	91.8112182617188
2019	91.8494033813477
2020	88.588493347168
2021	88.5773696899414