Year	% of cohort
1982	73.1802520751953
1985	86.011589050293
1986	79.9007873535156
1987	90.0617980957031
1991	80.5195693969727
1992	91.2247314453125
1993	87.7262115478516
1994	91.6007385253906
1995	80.7868728637695
1997	86.3076171875
1998	92.1151428222656
1999	89.3925399780273
2000	92.7324676513672
2001	98.8396301269531
2003	98.6549301147461
2004	99.4957809448242
2011	99.0967102050781
2015	98.0496597290039
2016	95.4214935302734
2017	98.2443466186523
2018	96.2192230224609