Year	% of cohort
1971	94.8850326538086
1972	95.6839904785156
1973	96.7844924926758
1981	99.0611877441406
1982	98.786750793457
1983	99.1946182250977
1984	98.1131286621094
1985	99.6971817016602
1986	98.9248580932617
1987	99.2907104492188
1988	98.9076080322266
1989	98.7239379882812
1990	99.2129287719727
1991	94.2866592407227
1992	99.7801895141602
1998	99.8506774902344
1999	99.8759078979492
2000	99.8896179199219
2004	92.5709991455078
2005	99.7517318725586
2007	98.1346893310547
2008	99.7337112426758
2009	99.243278503418
2012	99.3994598388672
2013	99.727653503418
2014	99.9210891723633
2016	99.462272644043
2017	99.8034210205078
2018	99.8835830688477
2019	99.8746337890625
2020	99.8348007202148
2021	99.9348831176758