Year	% of cohort
1989	96.0101318359375
1992	93.205322265625
1998	95.8310012817383
1999	96.3538208007812
2000	94.6790084838867
2001	96.2892303466797
2002	95.4581909179688
2003	95.7842330932617
2004	95.3886489868164
2005	94.21875
2007	93.5372924804688
2008	94.3998489379883
2009	97.058723449707
2010	95.0125427246094
2011	94.2797927856445
2018	94.3811721801758
2019	95.4230804443359
2020	95.8911666870117