Year	% of cohort
1974	73.0680618286133
1975	70.7268676757812
1976	74.7131576538086
1977	69.8264389038086
1978	72.9699935913086
1979	75.2958526611328
1980	76.2819595336914
1981	76.0673675537109
1982	68.1228408813477
1983	70.0563278198242
1984	75.1000137329102
1985	79.7926483154297
1986	80.9517364501953
1987	80.7905120849609
2005	96.4186782836914
2006	96.2592086791992
2007	91.239372253418
2008	96.5216522216797
2009	98.9410705566406
2012	99.1104125976562
2013	95.7179565429688
2014	96.6534729003906
2015	98.0694427490234
2016	96.1372833251953
2017	96.9825897216797
2018	97.0184478759766
2019	97.0440826416016
2020	97.2942276000977