Year	% of cohort
1970	61.3828887939453
1971	62.3781700134277
1972	62.3779182434082
1973	63.7582702636719
1974	64.7902908325195
1975	64.1157836914062
1976	64.6032333374023
1977	65.5000076293945
1978	64.8810882568359
1979	65.1396179199219
1980	64.9923629760742
1981	65.1077880859375
1982	66.169319152832
1983	66.0144195556641
1984	65.9985733032227
1985	66.3351898193359
1986	66.6188507080078
1987	65.8221435546875
1988	64.8527297973633
1989	65.0562591552734
1990	65.5587692260742
1991	64.9325332641602
1992	66.2860794067383
1993	65.5095291137695
1994	63.9964485168457
1995	64.3689804077148
1996	62.5853614807129
1997	62.3855094909668
1998	62.5763511657715
1999	62.3902587890625
2000	64.0660018920898
2001	65.5837326049805
2002	63.6890487670898
2003	61.268741607666
2004	62.0337409973145
2005	62.3867492675781
2006	58.3452301025391
2007	57.0682983398438
2008	60.5189514160156
2009	56.357608795166
2010	55.620189666748
2011	57.5101013183594
2012	55.8357810974121
2013	55.4521903991699
2014	55.8722991943359
2015	56.7534408569336
2016	56.7390098571777
2017	58.1770210266113
2018	59.1613616943359
2019	59.7895889282227
2020	60.9233589172363