Year	% of cohort
1994	98.3627471923828
1995	97.958122253418
1996	100
1998	99.4050979614258
1999	99.0943298339844
2000	99.8247375488281
2001	99.6643524169922
2002	99.1265335083008
2005	99.2306594848633
2006	99.2723770141602
2007	97.4114227294922
2008	98.6639709472656
2009	98.5478286743164
2010	99.8123626708984
2011	99.0922622680664
2012	99.3897705078125
2013	97.5738296508789
2014	99.3083267211914
2015	97.0800323486328
2016	97.3331604003906
2017	96.59765625
2018	97.8912887573242
2019	98.6287689208984
2020	98.2766494750977