Year	% of cohort
1984	93.337028503418
1985	97.0829391479492
1986	95.2685928344727
1987	96.5157623291016
1988	95.8855972290039
1989	95.9800567626953
1990	94.8101425170898
1991	96.98046875
1992	92.6137008666992
1993	90.0637435913086
2004	96.2746810913086
2005	98.1678314208984
2006	97.9907836914062
2007	94.4734573364258
2008	93.027099609375
2009	100
2010	95.4279632568359
2011	89.2361526489258
2013	93.8912734985352
2014	87.7254028320312
2015	95.7996292114258
2016	99.9324417114258
2017	99.9652786254883
2018	99.8298187255859
2019	99.8473129272461
2020	99.8428115844727