Year	% of cohort
1971	54.221809387207
1972	54.5788688659668
1973	55.862548828125
1974	56.3024787902832
1975	56.0907402038574
1976	56.375431060791
1977	57.5328788757324
1978	57.6497497558594
1979	58.4873085021973
1980	58.1707916259766
1981	58.421630859375
1982	59.389591217041
1983	59.6401290893555
1984	60.2216682434082
1985	61.0729103088379
1986	61.9681282043457
1987	62.4227905273438
1988	62.7208213806152
1989	62.8147392272949
1990	63.5263214111328
1991	63.3771591186523
1992	64.3894271850586
1993	64.2266082763672
1994	63.5363998413086
1995	64.0976486206055
1996	63.3286590576172
1997	63.5044097900391
1998	63.7329406738281
1999	64.5623092651367
2000	65.4972763061523
2001	66.7058486938477
2002	65.8978424072266
2003	64.602668762207
2004	64.9163513183594
2005	64.9563293457031
2006	62.104808807373
2007	61.171558380127
2008	63.3202514648438
2009	60.7610206604004
2010	59.3270416259766
2011	61.4810981750488
2012	59.5359916687012
2013	61.1711196899414
2014	61.7285690307617
2015	62.6185989379883
2016	62.0327796936035
2017	63.0441703796387
2018	62.8230590820312
2019	63.3491401672363
2020	64.2797164916992