Year	% of cohort
1971	98.5453872680664
1972	98.3142471313477
1973	97.4247207641602
1974	72.2525024414062
1975	95.2293701171875
1976	97.7208480834961
1977	99.3105773925781
1978	99.2225189208984
1979	98.8689880371094
1980	97.8641662597656
1981	100
1982	99.0223693847656
1983	99.0042419433594
1984	99.0621337890625
1985	99.3515319824219
1986	98.6718215942383
1987	98.7822723388672
1988	98.7407608032227
1989	100
1991	99.5673065185547
1992	99.1932067871094
1993	99.1633987426758
1994	99.9130020141602
1999	96.3120727539062
2000	99.2733688354492
2001	98.2928695678711
2002	98.7243118286133
2003	98.2941589355469
2004	97.713752746582
2005	99.6594696044922
2006	98.7766571044922
2007	96.7720794677734
2012	96.6608123779297
2013	92.7121963500977
2014	97.6631698608398
2015	98.9926910400391
2016	99.2169876098633
2019	99.1409606933594
2020	96.1797027587891