Year	% of cohort
1971	62.9588317871094
1972	62.7517585754395
1973	61.9141311645508
1974	61.7415008544922
1975	63.1864204406738
1976	64.4039611816406
1977	66.04296875
1978	65.7027587890625
1979	65.8266906738281
1980	65.3815765380859
1981	65.7902984619141
1982	66.5045700073242
1983	66.8958969116211
1984	66.6698837280273
1985	67.4501266479492
1986	68.4987869262695
1987	70.2200469970703
1988	70.2385711669922
1989	70.4058074951172
1990	71.7792816162109
1991	72.1165008544922
1992	72.523681640625
1993	73.2080993652344
1994	73.5980224609375
1995	74.63818359375
1996	74.7341079711914
1997	74.9970397949219
1998	74.883171081543
1999	74.9092788696289
2000	74.8476791381836
2001	76.5945129394531
2002	75.8281402587891
2003	75.1863098144531
2004	75.3316802978516
2005	75.8367385864258
2006	75.3893203735352
2007	75.2980880737305
2008	76.8581771850586
2009	76.8143920898438
2010	76.5165176391602
2011	77.5733108520508
2012	76.8824081420898
2013	77.9291381835938
2014	81.0588607788086
2015	81.3157577514648
2016	80.4580535888672
2017	80.8312072753906
2018	81.3096313476562
2019	83.7642517089844
2020	83.8891372680664
2021	84.5062866210938