Year	% of cohort
1970	93.1772689819336
1971	93.2038879394531
1972	93.3105010986328
1973	93.5647811889648
1974	93.9080429077148
1975	93.8730010986328
1976	93.8701324462891
1977	94.3671188354492
1978	94.4275588989258
1979	94.3570175170898
1980	94.2574768066406
1981	93.993537902832
1982	94.0851287841797
1983	93.9184875488281
1984	94.1663970947266
1985	94.1222534179688
1986	94.1777572631836
1987	93.9380416870117
1988	94.1116485595703
1989	93.9789199829102
1990	94.5715179443359
1991	94.9211502075195
1992	95.025016784668
1993	94.9875106811523
1994	94.8312683105469
1995	94.6893310546875
1996	94.5095672607422
1997	94.6103134155273
1998	94.8849716186523
1999	94.864616394043
2000	95.0075912475586
2001	95.0330276489258
2002	95.1528167724609
2003	95.1660308837891
2004	95.2537231445312
2005	95.3651809692383
2006	95.2607574462891
2007	95.2212066650391
2008	95.0691680908203
2009	94.9829864501953
2010	94.9504318237305
2011	95.052001953125
2012	95.077880859375
2013	95.0647964477539
2014	94.100830078125
2015	95.0882415771484
2016	95.359016418457
2017	95.4541625976562
2018	95.546012878418
2019	95.5300827026367
2020	94.3333587646484
2021	94.1417999267578