Year	% of cohort
1992	97.4670181274414
1993	97.6336212158203
1995	98.5527267456055
1997	93.4709777832031
1998	97.3891525268555
1999	96.8344497680664
2000	95.9823303222656
2001	96.7378692626953
2002	96.5230178833008
2003	97.7129974365234
2004	97.8585205078125
2005	96.9084396362305
2006	98.6762619018555
2007	99.265007019043
2008	98.4216537475586
2009	96.3609390258789
2010	97.2073593139648
2011	98.1864318847656
2012	98.8123168945312
2013	97.2626190185547
2014	97.6206436157227
2015	98.8520431518555
2016	94.5974807739258
2017	94.4138717651367
2018	95.7502593994141
2019	95.3331909179688
2020	94.1528778076172
2021	99.2299270629883