Year	% of cohort
1991	61.1105003356934
1993	79.9085998535156
1997	84.2010803222656
1998	79.845458984375
1999	92.4471435546875
2002	86.6532669067383
2003	79.8739318847656
2004	84.2715911865234
2005	84.1528167724609
2008	90.28369140625
2009	91.7006988525391
2012	96.2524032592773
2017	89.5967788696289