Year	% of cohort
1970	66.8762969970703
1971	67.6008377075195
1972	68.8493270874023
1973	69.5842895507812
1974	66.2709808349609
1975	65.2730407714844
1976	66.3532409667969
1977	67.0200119018555
1978	68.4572525024414
1979	69.4199066162109
1980	70.5241470336914
1981	70.443359375
1982	69.9690399169922
1983	69.5721969604492
1984	70.7124786376953
1985	70.4888687133789
1986	71.3481369018555
1987	70.4999465942383
1988	70.7891006469727
1989	71.6089477539062
1990	71.4566497802734
1991	70.7165603637695
1992	71.9296112060547
1993	74.9564590454102
1994	73.7784881591797
1995	71.7594528198242
1996	72.9312362670898
1997	73.7286834716797
1998	72.7509307861328
1999	72.4104690551758
2000	72.4090576171875
2001	72.3328094482422
2002	73.619270324707
2003	72.8043823242188
2004	72.5576705932617
2005	73.2453308105469
2006	71.771110534668
2007	73.9482727050781
2008	73.4487991333008
2009	73.6008987426758
2010	73.1396102905273
2011	74.9492797851562
2012	74.2277297973633
2013	76.0846786499023
2014	76.2233734130859
2015	76.5294418334961
2016	75.9935531616211
2017	76.1557235717773
2018	76.2118225097656
2019	74.6866226196289
2020	73.9032287597656