Year	% of cohort
1971	48.8672904968262
1972	44.8904800415039
1973	51.4134712219238
1974	63.3116989135742
1975	51.6921081542969
1976	58.7156982421875
1977	59.3352317810059
1978	61.7886085510254
1979	62.8586692810059
1980	64.1762084960938
1981	69.2979278564453
1982	70.1482772827148
1983	70.4555816650391
1984	70.3635330200195
1986	71.5796508789062
1987	67.46630859375
1988	68.8124923706055
1989	64.6647109985352
1990	72.0835266113281
1994	76.0411682128906
1998	61.3302993774414
1999	63.4233818054199
2000	63.3934516906738
2001	61.2965888977051
2002	68.5542221069336
2003	71.3195419311523
2004	70.1614303588867
2005	66.1808624267578
2006	73.8424530029297
2007	70.6811294555664
2008	71.5386276245117
2009	66.5994415283203
2011	72.7853775024414
2012	74.5708618164062
2013	74.631103515625
2014	70.701171875
2015	73.9205932617188
2016	70.9876403808594
2017	73.6684875488281
2018	62.0553894042969
2019	61.1442909240723
2020	69.5299987792969
2021	52.7968215942383