Year	% of cohort
1995	96.2188568115234
1999	94.5179672241211
2000	93.0335006713867
2001	92.1478805541992
2002	93.4833679199219
2003	95.8246231079102
2004	96.8668594360352
2005	98.0801162719727
2006	96.4964294433594
2007	98.347038269043
2008	96.2208404541016
2009	97.647819519043
2010	95.2949829101562
2011	97.0536422729492
2012	97.7431716918945
2013	98.7944412231445
2014	96.7175521850586
2015	98.334846496582
2016	97.6122207641602
2017	98.1380310058594
2018	98.2527618408203
2019	97.6910934448242
2020	97.6644515991211