Year	% of cohort
1970	93.5048828125
1971	93.4681625366211
1972	93.691780090332
1979	94.8791809082031
1980	95.3479614257812
1981	95.4638519287109
1982	95.3379821777344
1983	95.7214813232422
1984	96.3543472290039
1985	96.3993988037109
1986	96.1450729370117
1987	95.6318817138672
1988	95.9013977050781
1989	95.7698669433594
1990	96.1700668334961
1991	96.3468933105469
1992	96.4305877685547
1993	96.8082427978516
1994	96.0798873901367
1995	97.2170486450195
1996	96.4412384033203
1997	95.958251953125
1998	97.318229675293
1999	97.2926483154297
2000	97.5248489379883
2001	97.5312271118164
2002	97.6962890625
2003	97.9708404541016
2004	98.0639801025391
2005	97.9114837646484
2006	97.7525482177734
2007	97.4748382568359
2008	97.632438659668
2009	97.481201171875
2010	97.3839416503906
2011	97.3719635009766
2012	97.1513900756836
2013	97.3037185668945
2014	97.4925537109375
2015	97.7332916259766
2016	97.7299499511719
2017	98.0759963989258
2018	98.107536315918
2019	98.1645278930664
2020	98.1587600708008
2021	98.1530609130859