Year	% of cohort
1982	96.1574172973633
1985	88.4808120727539
1986	84.5726318359375
1987	91.4842376708984
1991	81.8606262207031
1992	93.765380859375
1993	90.8408203125
1994	90.1395263671875
1995	81.8759994506836
1997	88.1095504760742
1998	92.8376922607422
1999	91.2735977172852
2000	91.9492874145508
2001	97.4186019897461
2003	98.6960830688477
2004	96.9109573364258
2011	96.5091018676758
2015	99.1384963989258
2016	97.7678909301758
2017	96.2004165649414
2018	97.3610382080078