Year	% of cohort
1974	89.2697219848633
1975	82.172737121582
1980	89.8805999755859
1981	81.9292221069336
1982	97.5598220825195
1983	82.6405715942383
1985	87.3702087402344
1986	75.9143905639648
1987	76.1175079345703
1988	81.6343231201172
1990	80.2873916625977
1991	82.4829711914062
1992	85.3619613647461
1993	81.4525375366211
1996	84.3108367919922
1997	78.9736785888672
1998	83.1938781738281
1999	79.651611328125
2000	83.2583694458008
2001	96.6830902099609
2003	89.602897644043
2004	84.2508316040039
2005	86.4769973754883
2006	88.866828918457
2008	83.0329895019531
2009	92.723503112793
2012	86.7974472045898
2015	73.2957763671875
2017	95.7931213378906
2018	90.2662506103516
2019	87.181266784668