Year	% of cohort
1974	51.750560760498
1975	57.7583618164062
1977	61.7962112426758
1978	61.5790100097656
1982	86.6971893310547
1983	88.8592987060547
1984	95.8038177490234
1985	91.2125625610352
1986	90.713249206543
1987	92.013801574707
1988	93.4688873291016
1989	92.6883010864258
1991	94.6267471313477
1993	95.7606582641602
1994	95.3777008056641
1995	95.6127700805664
1996	95.9295883178711
1997	94.93115234375
1998	94.5335311889648
1999	93.8115768432617
2000	96.7102813720703
2001	96.4217071533203
2002	98.0520401000977
2011	96.8638381958008
2012	98.4242935180664
2014	98.5734100341797
2015	98.7087936401367
2016	98.6392593383789