Year	% of cohort
1974	71.8462219238281
1975	68.6132125854492
1976	75.487678527832
1977	67.3563995361328
1978	70.6785888671875
1979	73.9022979736328
1980	73.8874130249023
1981	75.1215209960938
1982	63.4362487792969
1983	67.7842025756836
1984	72.5155029296875
1985	77.5772399902344
1986	78.8709106445312
1987	78.8022613525391
2005	95.9053497314453
2006	95.471321105957
2007	90.476188659668
2008	95.57568359375
2009	97.9125823974609
2012	98.2475662231445
2013	94.837272644043
2014	95.8957366943359
2015	97.4107971191406
2016	95.2776718139648
2017	96.0541534423828
2018	96.0840072631836
2019	96.0602874755859
2020	96.7889099121094