Year	% of cohort
1971	66.8108291625977
1972	63.5655097961426
1973	51.0929107666016
1975	60.7040710449219
1976	53.9896507263184
1977	53.6768989562988
1978	60.5339813232422
1979	54.1321907043457
1980	62.2909317016602
1982	59.8088111877441
1983	38.5341300964355
1984	56.6393013000488
1985	44.1264610290527
1986	50.5368194580078
1987	42.6324691772461
1988	47.6391716003418
1989	14.4093599319458
1991	54.6516990661621
1992	66.9918899536133
1993	55.737621307373
1994	66.7911605834961
1995	63.5715103149414
1996	68.8284072875977
1997	65.9450225830078
2000	88.8100967407227
2001	74.9387130737305
2002	70.4112014770508
2003	69.8943099975586
2009	61.6988487243652
2010	65.0610961914062
2011	67.7184677124023
2012	61.7982597351074
2013	62.8311614990234
2014	67.5504989624023
2015	57.8124084472656
2018	44.5184707641602
2019	49.9961395263672
2020	65.4151916503906
2021	62.212760925293