Year	% of cohort
1972	55.4350090026855
1973	57.1790084838867
1974	63.3518905639648
1975	58.5077705383301
1976	53.3821105957031
1977	64.2966003417969
1978	62.461009979248
1979	62.7571907043457
1980	68.3565216064453
1981	65.2266082763672
1982	69.1529006958008
1983	58.0970115661621
1984	68.6239624023438
1985	67.5274963378906
1986	71.9912414550781
1987	68.8967666625977
1990	59.5221900939941
1999	76.1735610961914
2006	57.2903518676758
2007	56.8550186157227
2008	68.8388519287109
2009	66.1621627807617
2010	57.0865592956543
2011	69.7548217773438
2014	65.7511520385742
2015	57.0588607788086
2016	41.2143402099609
2017	38.0223617553711
2018	63.9379615783691
2021	66.4088592529297