Year	% of cohort
1975	95.9821090698242
1976	96.4782333374023
1977	95.5180130004883
1978	96.7926712036133
1979	96.9081878662109
1980	96.9314727783203
1981	97.4292831420898
1982	97.4554901123047
1983	97.3515701293945
1984	97.8010025024414
1985	97.0870895385742
1986	97.244873046875
1987	96.7607498168945
1988	98.4820709228516
1989	97.682861328125
1996	96.9771881103516
1997	95.008430480957
1998	96.7647933959961
1999	97.5545425415039
2000	95.1816864013672
2001	97.1947402954102
2002	97.9779434204102
2003	97.5807037353516
2004	98.4208984375
2005	98.3049163818359
2006	98.2687301635742
2007	98.789306640625
2008	97.8751983642578
2009	98.0194702148438
2010	98.619270324707
2011	98.554817199707
2012	97.8721313476562
2013	98.4850463867188
2014	97.9759521484375
2015	98.4748306274414
2016	97.8752288818359
2017	99.1318664550781
2018	99.2134017944336
2019	98.998779296875
2020	99.2779769897461