Year	% of cohort
1971	96.4069366455078
1972	97.7254867553711
1973	96.6480865478516
1974	64.6284103393555
1975	94.4844284057617
1976	98.0016174316406
1977	99.0802993774414
1978	98.9334030151367
1979	98.6099090576172
1980	98.869873046875
1981	98.1505813598633
1982	99.2547302246094
1983	98.8055419921875
1984	98.5923767089844
1985	98.7765884399414
1986	98.1953277587891
1987	99.0633163452148
1988	98.7872085571289
1989	98.9870223999023
1991	99.2722015380859
1992	98.9516372680664
1993	98.9036102294922
1994	99.3831405639648
1999	94.922607421875
2000	98.8147277832031
2002	97.9648666381836
2003	98.6412811279297
2004	98.1361465454102
2005	98.6538619995117
2006	98.8821105957031
2007	95.2674102783203
2012	94.3906478881836
2013	90.8361587524414
2014	97.6132507324219
2015	98.1325607299805
2016	98.7563629150391
2019	97.2162094116211
2020	98.0556030273438