Year	% of cohort
1989	96.2836532592773
1992	93.091667175293
1994	95.9929428100586
1995	98.8278274536133
1996	94.7615737915039
1998	95.5329971313477
1999	95.666259765625
2000	94.4627914428711
2001	95.8266830444336
2002	95.2498779296875
2003	95.2293395996094
2004	94.9260177612305
2005	93.7002792358398
2007	93.2903900146484
2008	93.5479125976562
2009	97.1004486083984
2010	94.768669128418
2011	94.0499420166016
2018	94.3881301879883
2019	95.1251602172852
2020	95.7763137817383