Year	% of cohort
1970	47.0531806945801
1971	47.4794692993164
1972	48.1661911010742
1973	47.195728302002
1974	47.0018615722656
1975	49.7252388000488
1976	57.5604782104492
1977	56.2441902160645
1978	55.9416809082031
1979	55.4971199035645
1980	54.0323600769043
1981	57.5665702819824
1982	61.4794616699219
1983	62.5071182250977
1984	58.1364784240723
1985	59.8958892822266
1986	62.0254287719727
1987	62.8622398376465
1988	64.6240921020508
1989	65.5451126098633
1990	67.9696197509766
1991	70.8318862915039
1992	69.433349609375
1993	71.7690811157227
1994	73.4966278076172
1995	75.9053115844727
1996	76.4354476928711
1997	77.6060562133789
1998	79.089241027832
1999	79.3461685180664
2000	78.9528198242188
2001	81.8628082275391
2002	81.6370315551758
2003	82.0855484008789
2004	82.4405822753906
2005	83.1655426025391
2006	84.1340713500977
2007	84.2049713134766
2008	85.6054916381836
2009	85.5625381469727
2010	85.5191116333008
2011	84.9367904663086
2012	84.2767868041992
2013	86.5912399291992
2014	87.4259414672852
2015	87.4118576049805
2016	88.1933212280273
2017	88.2886428833008
2018	88.8083419799805
2019	88.5815277099609
2020	89.2197875976562
2021	89.5098419189453