Year	% of cohort
1971	64.7974166870117
1972	64.3315734863281
1973	63.2891082763672
1974	63.1643104553223
1975	64.8075485229492
1976	66.1397323608398
1977	67.9509963989258
1978	67.5714721679688
1979	67.6557235717773
1980	67.4630889892578
1981	68.032341003418
1982	68.4070281982422
1983	68.9877471923828
1984	68.6364517211914
1985	69.4026565551758
1986	70.5804290771484
1987	72.5311584472656
1988	72.4070816040039
1989	72.5833129882812
1990	74.2253875732422
1991	74.7205200195312
1992	74.9688873291016
1993	75.9294128417969
1994	76.6196136474609
1995	77.9526824951172
1996	78.5552368164062
1997	78.7700729370117
1998	78.7709503173828
1999	78.9135131835938
2000	78.7213134765625
2001	81.0253295898438
2002	80.1656723022461
2003	80.1044387817383
2004	80.3313293457031
2005	80.9223480224609
2006	82.0813903808594
2007	82.563591003418
2008	84.2352981567383
2009	85.181640625
2010	85.9743804931641
2011	86.4184799194336
2012	86.5448913574219
2013	87.3944320678711
2014	91.7297973632812
2015	91.6081314086914
2016	90.8915023803711
2017	91.0498199462891
2018	91.4193878173828
2019	95.2341537475586
2020	95.2953262329102
2021	95.7180709838867