Year	% of cohort
1973	98.9722595214844
1974	99.2982711791992
1975	97.8134307861328
1976	99.8200378417969
1977	99.6595001220703
1978	99.0125503540039
1979	99.9187698364258
1980	99.4874114990234
1981	99.7552795410156
1984	99.3236083984375
1985	99.9358596801758
1986	99.5056762695312
1987	99.7929077148438
1988	99.4670562744141
1989	99.4138793945312
1990	99.3570709228516
1991	99.8533096313477
1992	99.7544479370117
1998	99.2792663574219
1999	99.7139282226562
2000	99.2691879272461
2001	100
2002	98.8539276123047
2003	99.8506622314453
2004	99.8311233520508
2005	99.4461288452148
2006	99.3170776367188
2007	99.5917663574219
2008	99.163330078125
2009	99.5986480712891
2010	99.6802291870117
2011	99.6515121459961
2012	98.6487197875977
2013	99.7641220092773
2014	99.9921493530273
2015	99.6778411865234
2016	99.0236587524414
2017	99.3381118774414
2018	99.7268218994141
2019	100
2020	99.7848587036133