Year	% of cohort
1971	60.371509552002
1972	60.6685791015625
1973	62.4464492797852
1974	63.1034889221191
1975	62.7317886352539
1976	63.5896301269531
1977	64.4856109619141
1978	63.988410949707
1979	64.186653137207
1980	64.002197265625
1981	63.9076881408691
1982	65.1343002319336
1983	64.5629806518555
1984	64.51708984375
1985	64.7799606323242
1986	64.9002990722656
1987	64.2695770263672
1988	64.281379699707
1989	64.3445892333984
1990	64.9508972167969
1991	64.2680892944336
1992	65.3282470703125
1993	64.3647308349609
1994	63.0631294250488
1995	63.1801910400391
1996	61.3643798828125
1997	61.5498390197754
1998	61.9191703796387
1999	61.3567581176758
2000	63.1471405029297
2001	64.3163986206055
2002	62.3211517333984
2003	60.2785491943359
2004	61.1536712646484
2005	62.5019912719727
2006	57.7729682922363
2007	56.6021499633789
2008	60.4788818359375
2009	56.5755500793457
2010	55.6991386413574
2011	58.0481300354004
2012	56.8130111694336
2013	57.5890808105469
2014	58.5074806213379
2015	59.5212287902832
2016	59.2019195556641
2017	59.7551918029785
2018	61.0803298950195
2019	61.4001197814941
2020	62.2380981445312