Year	% of cohort
1970	82.0778198242188
1971	82.1875610351562
1972	83.3906173706055
1973	83.3109512329102
1974	83.0887298583984
1975	83.5772476196289
1976	84.6438827514648
1977	86.2551116943359
1978	85.7249984741211
1979	84.3171997070312
1980	81.7433319091797
1981	82.4664611816406
1982	84.8935012817383
1983	83.1248779296875
1984	82.593132019043
1985	83.3649215698242
1986	83.0459899902344
1987	82.6256866455078
1988	82.2648773193359
1989	81.7146530151367
1990	81.3906021118164
1991	80.1812133789062
1992	78.8370666503906
1993	79.5839462280273
1994	79.6920394897461
1995	77.3100662231445
1996	80.2697830200195
1997	80.4320068359375
1998	80.5127716064453
1999	78.9441680908203
2000	80.4917602539062
2001	79.3637619018555
2002	81.0175628662109
2003	82.7489471435547
2004	82.0905303955078
2005	82.0943603515625
2006	81.9535369873047
2007	82.4258728027344
2008	81.5018005371094
2009	81.6855316162109
2010	82.2783126831055
2011	80.6626815795898
2012	84.7186889648438
2013	83.5069198608398
2014	83.5481872558594
2015	85.8188018798828
2016	81.6555709838867
2017	77.9446563720703
2018	81.0093002319336
2019	78.4553833007812
2020	77.4941024780273