Year	% of cohort
1973	95.4547882080078
1974	95.2214813232422
1979	90.8296432495117
1980	97.1716003417969
1981	96.5254364013672
1982	93.9901504516602
1983	96.0178375244141
1984	99.5252227783203
1985	93.3599700927734
1986	95.1870727539062
1987	94.9333572387695
1991	94.2105178833008
1993	97.4942474365234
1996	92.140869140625
1999	97.1127014160156
2000	91.6431884765625
2001	97.0820922851562
2002	99.6336975097656
2003	90.4652633666992
2008	93.2516708374023
2010	97.4173126220703
2015	97.3545379638672
2017	96.4743423461914
2020	96.5743713378906