Year	% of cohort
1971	64.5748977661133
1972	64.994499206543
1973	66.1686096191406
1974	67.209587097168
1975	65.8284912109375
1976	66.7636489868164
1977	68.188720703125
1978	67.3412017822266
1979	67.5382232666016
1980	67.0344161987305
1981	67.2908401489258
1982	68.4102020263672
1983	68.7001800537109
1984	68.8850708007812
1985	69.4730529785156
1986	70.1597290039062
1987	69.3050308227539
1988	68.8096313476562
1989	68.0100936889648
1990	67.7949905395508
1991	66.2895965576172
1992	67.8288879394531
1993	66.9413070678711
1994	65.7264862060547
1995	66.4034271240234
1996	64.892936706543
1997	65.0009002685547
1998	65.1784896850586
1999	65.9094161987305
2000	66.1566925048828
2001	67.2979507446289
2002	66.2922134399414
2003	64.2477569580078
2004	63.1211318969727
2005	62.9271697998047
2006	58.9067497253418
2007	59.7998313903809
2008	63.9716796875
2009	58.619010925293
2010	57.6276817321777
2011	60.0678482055664
2012	57.5223503112793
2013	55.5371589660645
2014	54.9471588134766
2015	55.5106582641602
2016	55.3640289306641
2017	57.9774398803711
2018	58.3336181640625
2019	59.310619354248
2020	60.3957901000977