Year	% of cohort
1999	87.2219772338867
2000	94.5990524291992
2001	92.293212890625
2002	90.1481475830078
2003	94.4064865112305
2004	91.362678527832
2005	88.5850219726562
2006	95.2120819091797
2007	90.5771102905273
2008	94.4046020507812
2010	91.921501159668
2011	94.3896179199219
2013	94.8985290527344
2015	84.2062530517578
2016	94.0784225463867
2017	85.8908462524414
2018	86.2226867675781
2019	86.6240997314453
2020	87.7947235107422
2021	94.1981201171875