Year	% of cohort
1971	96.770637512207
1982	100
1983	99.6563568115234
1984	100
1986	96.7971496582031
1987	98.8644409179688
1988	100
1989	100
1990	100
1991	88.1091690063477
1992	85.4487915039062
1993	100
2008	93.5644912719727
2010	71.6864013671875
2011	96.2455902099609
2018	98.1872711181641
2019	97.9173278808594
2020	96.1759262084961
2021	97.7543487548828