Year	% of cohort
1979	97.7203674316406
1980	99.1558685302734
1981	99.0754165649414
1982	99.4903869628906
1983	99.4679870605469
1984	98.15283203125
2002	100
2003	99.7215118408203
2004	100
2007	99.5232009887695
2009	99.405891418457
2010	99.5693969726562
2011	99.6309661865234
2012	99.72119140625
2013	99.7575225830078
2014	99.2555084228516
2015	99.2639923095703
2016	99.5463409423828
2017	99.054573059082
2018	98.9216766357422
2019	98.4766387939453
2020	91.2602996826172
2021	85.720458984375