Year	% of cohort
1994	95.8658294677734
1995	98.7675094604492
1996	96.8343200683594
1998	98.2580490112305
1999	95.580322265625
2000	96.1139907836914
2001	96.5618133544922
2002	95.3904800415039
2003	97.9628372192383
2004	97.6467208862305
2005	93.9689483642578
2006	98.243896484375
2012	96.4854965209961
2013	96.6551132202148
2017	99.0682067871094
2018	87.7013931274414
2019	95.8363571166992
2020	95.2277221679688
2021	93.4367904663086