Year	% of cohort
1976	81.7022476196289
1977	84.6318206787109
1978	81.9653701782227
1979	81.3358993530273
1980	84.0494689941406
1981	84.1196823120117
1982	84.1747589111328
1983	84.8552322387695
1984	85.0041427612305
1985	84.3137664794922
1988	83.6500015258789
1989	85.4900283813477
1990	86.0453186035156
1992	87.1813278198242
1993	90.4123916625977
1994	91.9932403564453
1995	92.6660614013672
1996	91.6801605224609
1998	92.2673568725586
1999	92.8914413452148
2000	93.7761764526367
2001	95.6945571899414
2002	96.7071075439453
2003	96.6223373413086
2004	97.1889724731445
2005	97.0169372558594
2006	96.4067001342773
2007	96.3334197998047
2008	96.7505035400391
2009	96.4236373901367
2012	94.2783279418945
2013	96.1639709472656
2014	95.9450607299805
2015	92.1217422485352
2016	96.974479675293
2020	98.9477310180664