Year	% of cohort
1971	74.306999206543
1978	88.197021484375
1982	89.0213394165039
1983	85.6630783081055
1984	87.1289215087891
1987	90.3975372314453
1988	85.8912734985352
1989	90.3430709838867
1995	77.5784072875977
1996	86.5327377319336
1997	86.8168487548828
2000	66.5061721801758
2001	62.3970718383789
2002	74.3448333740234
2003	72.9291305541992
2004	65.850456237793
2005	53.8051986694336
2007	57.3679504394531
2008	56.4163513183594
2009	58.0848617553711
2010	58.7999305725098
2011	58.9704704284668
2012	56.3743896484375
2013	63.0604782104492
2014	55.9936218261719
2019	65.0124588012695
2020	56.9389610290527
2021	60.8068389892578