Year	% of cohort
1971	92.0639495849609
1972	93.7010879516602
1973	93.8705902099609
1975	92.9000930786133
1976	94.7485961914062
1977	96.5807418823242
1978	95.0769805908203
1979	92.3478698730469
1980	93.3341217041016
1983	93.2827606201172
1984	93.6935272216797
1985	93.976432800293
1991	85.6088485717773
1994	88.4365081787109
1995	85.3614730834961
1996	92.5249099731445
1997	91.5598220825195
1998	91.3866119384766
1999	87.4327011108398
2000	89.8139495849609
2001	87.3818511962891
2003	95.9973526000977
2007	91.8505630493164
2008	94.2862167358398
2011	97.0811767578125
2012	98.3807983398438
2015	92.4998397827148
2019	79.5470886230469