Year	% of cohort
1970	60.9509010314941
1971	62.0065116882324
1972	62.6079902648926
1973	64.1169662475586
1974	65.1099014282227
1975	63.8882217407227
1976	65.0754165649414
1977	66.4537506103516
1978	65.3532104492188
1979	65.6298904418945
1980	65.1909637451172
1981	65.3161315917969
1982	66.7193984985352
1983	66.5636825561523
1984	66.6331024169922
1985	67.3435363769531
1986	67.8804321289062
1987	67.4405212402344
1988	66.8103713989258
1989	66.1186981201172
1990	66.0960998535156
1991	64.8433837890625
1992	66.2646789550781
1993	65.2453994750977
1994	64.106819152832
1995	64.6735000610352
1996	63.0966796875
1997	63.4963684082031
1998	63.7416496276855
1999	64.5656890869141
2000	64.9516677856445
2001	65.9348602294922
2002	64.7490768432617
2003	62.8112716674805
2004	61.6581993103027
2005	62.1919708251953
2006	57.7266693115234
2007	58.6016082763672
2008	63.1504096984863
2009	58.2960205078125
2010	57.0947799682617
2011	59.7824401855469
2012	57.6698417663574
2013	56.9522590637207
2014	56.8542900085449
2015	57.5674896240234
2016	57.2110290527344
2017	58.9855194091797
2018	59.6995811462402
2019	60.4498291015625
2020	61.1547317504883