Year	% of cohort
1972	80.6893997192383
1973	76.6399230957031
1974	84.4666290283203
1975	76.6067123413086
1976	90.1917190551758
1977	89.851921081543
1984	67.9012298583984
1985	69.0039520263672
1986	71.7749328613281
1988	77.2040405273438
1989	72.2383804321289
1990	63.160270690918
1991	70.1682891845703
1992	58.4408416748047
1993	81.0593566894531
1994	71.4901733398438
1995	68.6753005981445
1996	67.0104904174805
1997	65.493766784668
1998	80.4856262207031
1999	62.388671875
2000	87.3145217895508
2006	75.5400085449219
2008	60.7737197875977
2011	82.1778106689453
2012	73.1187515258789
2013	74.0388336181641
2014	82.743278503418
2015	82.0025405883789
2016	73.2640075683594
2019	78.0274810791016
2020	70.1076736450195
2021	65.8350219726562