Year	% of cohort
1971	67.9356994628906
1972	63.0659790039062
1973	70.0077362060547
1974	84.3224182128906
1975	84.1728668212891
1976	86.5058288574219
1977	87.9355697631836
1978	84.5554504394531
1979	85.8311309814453
1980	86.7549133300781
1981	86.6088485717773
1982	87.6581802368164
1983	87.0450210571289
1984	87.5056076049805
1985	87.4752578735352
1988	85.9263229370117
1989	87.2755508422852
1990	87.3391494750977
1991	86.5651321411133
1992	87.6408386230469
1993	90.5038833618164
1994	91.6705017089844
1995	92.3925933837891
1996	91.0121383666992
1998	91.5964126586914
1999	92.160758972168
2000	93.1024475097656
2001	95.4565277099609
2002	96.1536865234375
2003	96.4947509765625
2004	96.8361587524414
2005	96.7288436889648
2006	96.425910949707
2007	96.0750198364258
2008	96.0895690917969
2009	96.1914825439453
2012	95.6957092285156
2013	94.4507293701172
2014	96.2802505493164
2015	88.5015182495117
2016	96.7660217285156
2020	98.5748825073242