Year	% of cohort
1971	82.4453735351562
1972	85.9052734375
1973	79.2135696411133
1974	78.9284286499023
1975	82.6154403686523
1976	78.8216018676758
1977	77.2405700683594
1978	81.3512420654297
1979	78.9222793579102
1980	81.2264785766602
1981	86.3013687133789
1982	87.2869262695312
1983	89.9060134887695
1984	92.2915191650391
1985	93.8656234741211
1988	86.9335174560547
1989	85.0148086547852
1990	92.5387878417969
1991	90.3345184326172
1992	87.0278091430664
1993	86.9654922485352
1994	83.831787109375
1995	85.2206802368164
1996	89.2117309570312
1997	82.9588012695312
1998	87.3994064331055
1999	86.9370269775391
2000	88.7245101928711
2001	88.3366012573242
2003	91.7616500854492
2004	94.2133483886719
2005	92.1799011230469
2006	95.1706085205078
2007	96.6808700561523
2008	93.4913024902344
2009	94.5910263061523
2010	95.6451416015625
2011	93.1637115478516
2020	68.3884429931641
2021	87.3805999755859
2022	89.1786499023438