Year	% of cohort
1970	48.1725997924805
1971	48.6388511657715
1972	49.4253196716309
1973	50.9790191650391
1974	54.3396415710449
1975	55.2514801025391
1976	55.605541229248
1977	57.7630004882812
1978	55.4208793640137
1979	54.9728584289551
1980	54.381160736084
1981	52.3704299926758
1982	54.8683700561523
1983	52.7945213317871
1984	52.4359283447266
1985	54.6044082641602
1986	55.3249397277832
1987	54.0003700256348
1988	53.3632011413574
1989	53.6102104187012
1990	54.278938293457
1991	53.5159187316895
1992	55.2265510559082
1993	53.6818695068359
1994	52.2790908813477
1995	53.3743286132812
1996	52.171070098877
1997	52.184928894043
1998	52.0877418518066
1999	54.299991607666
2000	57.2548408508301
2001	59.5372886657715
2002	57.5363502502441
2003	56.1047515869141
2004	57.8258590698242
2005	58.0243682861328
2006	58.2478294372559
2007	57.5292701721191
2008	56.0279998779297
2009	53.4195404052734
2010	52.109489440918
2011	54.9681396484375
2012	53.5107116699219
2013	54.5777015686035
2014	55.5947418212891
2015	56.9636306762695
2016	56.4388809204102
2017	57.1846389770508
2018	58.8697700500488
2019	59.4565315246582
2020	60.4178810119629
2021	60.0718803405762