Year	% of cohort
1972	95.0878295898438
1973	97.6471099853516
1974	96.1651916503906
1976	57.0648803710938
1978	93.0568389892578
1979	97.7362670898438
1981	96.4869384765625
1982	94.6354598999023
1983	92.0238265991211
1984	92.5250930786133
1985	91.0055389404297
1986	90.2920074462891
1994	91.0735397338867
1995	98.376708984375
1996	95.5515823364258
1998	91.2516708374023
1999	94.0111389160156
2000	94.8482284545898
2001	98.2920227050781
2002	97.461181640625
2003	98.4170837402344
2009	95.9930572509766
2011	94.0715408325195
2012	95.698486328125
2015	96.0771331787109
2016	92.2715835571289
2017	92.7654495239258
2018	88.5445327758789
2019	93.9547424316406
2020	85.7431411743164