Year	% of cohort
1982	94.7715835571289
1983	94.4760284423828
1984	94.2592010498047
1985	94.9935531616211
1986	94.9451599121094
1987	95.3815383911133
1988	95.1611709594727
1989	94.9664535522461
1990	95.6846084594727
1991	96.841552734375
1992	96.0102233886719
1993	95.6334915161133
1994	95.7180786132812
1995	96.2898712158203
1996	95.5574111938477
1997	94.9924621582031
1998	95.9285125732422
1999	95.8828201293945
2000	96.5447235107422
2001	96.6413192749023
2002	96.6834411621094
2003	96.7176208496094
2004	97.0139923095703
2005	97.2127685546875
2006	97.0124435424805
2007	96.1429901123047
2008	95.8003234863281
2009	98.0430297851562
2010	96.6789169311523
2011	95.6038208007812
2012	95.9762878417969
2013	96.5921096801758
2014	94.1293869018555
2015	97.1544189453125
2016	98.1144409179688
2017	98.6816864013672
2018	98.725212097168
2019	98.7336807250977
2020	98.685661315918
2021	98.7741622924805