Year	% of cohort
1970	61.374210357666
1971	62.3706398010254
1972	62.3703994750977
1973	63.752368927002
1974	64.7850570678711
1975	64.1124114990234
1976	64.599983215332
1977	65.4965896606445
1978	64.8777008056641
1979	65.1364898681641
1980	64.9876098632812
1981	65.1033935546875
1982	66.1657104492188
1983	66.0105285644531
1984	65.9941024780273
1985	66.3307571411133
1986	66.6151733398438
1987	65.8185272216797
1988	64.8491287231445
1989	65.0525970458984
1990	65.5551528930664
1991	64.9293594360352
1992	66.2830429077148
1993	65.5065231323242
1994	63.9934997558594
1995	64.3658676147461
1996	62.5822792053223
1997	62.3827018737793
1998	62.5732803344727
1999	62.3871307373047
2000	64.0640335083008
2001	65.5814590454102
2002	63.6867408752441
2003	61.2673797607422
2004	62.0323486328125
2005	62.3852996826172
2006	58.3435096740723
2007	57.0665588378906
2008	60.5172996520996
2009	56.3557205200195
2010	55.6182289123535
2011	57.5082702636719
2012	55.8339004516602
2013	55.4503288269043
2014	55.8703804016113
2015	56.7516403198242
2016	56.7372283935547
2017	58.1750907897949
2018	59.1597518920898
2019	59.7880210876465
2020	60.9218711853027