Year	% of cohort
1970	47.5544700622559
1971	46.1208114624023
1972	46.0593185424805
1973	45.370548248291
1974	44.9999084472656
1975	47.9464797973633
1976	52.464298248291
1977	51.865119934082
1978	52.0112609863281
1979	51.4345703125
1980	50.5445098876953
1981	53.7577590942383
1982	57.2214012145996
1983	58.2515983581543
1984	53.9873504638672
1985	56.6623992919922
1986	59.3057403564453
1987	58.9229888916016
1988	60.8050193786621
1989	61.835521697998
1990	64.7646026611328
1991	67.3058395385742
1992	66.2471237182617
1993	68.9406204223633
1994	69.5252685546875
1995	71.773551940918
1996	72.1208419799805
1997	73.1977005004883
1998	74.1002883911133
1999	75.9316024780273
2000	75.375732421875
2001	78.3670806884766
2002	77.8177337646484
2003	78.4163208007812
2004	79.0084762573242
2005	79.3535003662109
2006	80.4773635864258
2007	80.2598266601562
2008	82.435188293457
2009	82.7578811645508
2010	82.9078369140625
2011	82.3026123046875
2012	82.0910034179688
2013	83.3793182373047
2014	84.3653182983398
2015	83.3122482299805
2016	85.3552932739258
2017	85.0252914428711
2018	85.3901214599609
2019	85.3642730712891
2020	86.2363815307617
2021	86.3333587646484