Year	% of cohort
1970	48.7329597473145
1971	47.9963798522949
1972	48.4857215881348
1973	47.5826416015625
1974	47.3322410583496
1975	50.1819000244141
1976	55.9021911621094
1977	55.18212890625
1978	54.9988708496094
1979	54.5648612976074
1980	53.5053100585938
1981	56.7260818481445
1982	60.1784706115723
1983	61.1082611083984
1984	57.1615180969238
1985	59.283561706543
1986	61.7010307312012
1987	61.6973609924316
1988	63.5647087097168
1989	64.4874801635742
1990	67.3932113647461
1991	69.8726272583008
1992	68.5558395385742
1993	71.0424270629883
1994	72.1769714355469
1995	74.4726715087891
1996	74.9490585327148
1997	76.0160827636719
1998	77.1436233520508
1999	78.2388381958008
2000	77.774658203125
2001	80.6187210083008
2002	80.0184707641602
2003	80.6985092163086
2004	81.0975036621094
2005	81.7012710571289
2006	82.8931884765625
2007	82.4153213500977
2008	84.4092102050781
2009	84.5844879150391
2010	84.7243194580078
2011	84.2187728881836
2012	83.8317337036133
2013	85.3241500854492
2014	86.1479187011719
2015	85.4508514404297
2016	86.8139495849609
2017	86.6992568969727
2018	87.1263122558594
2019	87.0031585693359
2020	87.7481231689453
2021	87.901496887207