Year	% of cohort
1970	94.4004211425781
1971	94.3578186035156
1972	94.4334182739258
1973	94.5587997436523
1974	94.6050033569336
1975	94.730583190918
1976	94.8329010009766
1977	95.0702209472656
1978	94.9813919067383
1979	94.8812484741211
1980	94.7276382446289
1981	94.7184219360352
1982	94.4443206787109
1983	94.4783477783203
1984	94.6240386962891
1985	95.0979995727539
1986	94.8232498168945
1987	94.9380722045898
1988	95.051399230957
1989	95.0835037231445
1990	95.5763397216797
1991	96.2831726074219
1992	95.7898788452148
1993	95.6537322998047
1994	95.7417068481445
1995	96.1523666381836
1996	95.7510070800781
1997	95.3996734619141
1998	96.0271987915039
1999	96.0347366333008
2000	96.4871520996094
2001	96.6024017333984
2002	96.6711502075195
2003	96.8285522460938
2004	97.064208984375
2005	97.1234436035156
2006	97.0097122192383
2007	96.4511413574219
2008	96.3279266357422
2009	97.3578033447266
2010	96.7357711791992
2011	96.1386337280273
2012	96.2672500610352
2013	96.7047805786133
2014	95.4328689575195
2015	97.2422103881836
2016	98.0156707763672
2017	98.3541030883789
2018	98.3963623046875
2019	98.4080200195312
2020	98.3246612548828
2021	98.3801193237305