Year	% of cohort
1977	90.4979095458984
1984	95.8421325683594
1985	87.8288497924805
1986	93.5398712158203
1987	94.3410720825195
1988	94.9995880126953
1989	96.0007629394531
1990	94.2133178710938
1991	94.3488235473633
1992	94.9646911621094
1993	93.7730712890625
1994	95.5754699707031
1995	97.2615203857422
1996	94.4432907104492
1997	87.5994491577148
1998	89.8393402099609
2000	87.8758697509766
2001	94.1288528442383
2002	89.3737716674805
2003	91.4753112792969
2004	95.3082580566406
2005	94.1655807495117
2006	95.3705368041992
2007	96.0903472900391
2008	96.9397277832031
2009	96.015380859375
2010	95.4660797119141
2011	99.3535232543945
2012	99.5851211547852
2013	99.5205230712891
2014	99.1378784179688
2015	99.6773681640625
2019	99.1211471557617
2020	99.2590789794922