Year	% of cohort
1970	49.4427108764648
1971	49.4300498962402
1972	50.1450614929199
1973	49.0333709716797
1974	48.827880859375
1975	51.6580200195312
1976	58.8146286010742
1977	57.9039497375488
1978	57.4689483642578
1979	57.1992492675781
1980	56.0110206604004
1981	59.3040084838867
1982	62.8065910339355
1983	63.701789855957
1984	60.0422897338867
1985	61.6110610961914
1986	63.8322296142578
1987	64.2762069702148
1988	66.1053771972656
1989	66.9677200317383
1990	69.8758773803711
1991	72.2590408325195
1992	70.67626953125
1993	72.9641189575195
1994	74.7059097290039
1995	77.0734329223633
1996	77.6761627197266
1997	78.7735824584961
1998	80.176399230957
1999	80.4990234375
2000	80.1095733642578
2001	82.8324279785156
2002	82.1708679199219
2003	82.9113998413086
2004	83.3088989257812
2005	83.9964828491211
2006	85.2695617675781
2007	84.5262985229492
2008	86.3662796020508
2009	86.3688201904297
2010	86.5343933105469
2011	86.1174011230469
2012	85.5579299926758
2013	87.2729263305664
2014	87.9411926269531
2015	87.5868301391602
2016	88.2528381347656
2017	88.3535995483398
2018	88.85205078125
2019	88.6333389282227
2020	89.2392501831055
2021	89.4925689697266