Year	% of cohort
1970	63.6204986572266
1973	67.8331832885742
1974	62.1432914733887
1975	65.7053070068359
1996	63.8381690979004
1998	87.8447570800781
1999	94.9929504394531
2000	90.7863922119141
2001	89.8346481323242
2002	80.782096862793
2003	95.0882720947266
2004	86.8068389892578
2005	94.499137878418
2006	94.8391723632812
2007	97.4050903320312
2008	93.770378112793
2009	95.2844467163086
2010	93.1264114379883
2011	96.2777862548828
2012	94.5679321289062
2013	95.9931106567383
2014	95.2898330688477
2015	97.4760131835938
2016	94.0043792724609
2017	94.2074890136719
2018	93.8656997680664
2019	94.4185180664062
2020	96.5119171142578