Year	% of cohort
1970	95.3829574584961
1971	95.3698196411133
1972	95.4574203491211
1973	95.5453414916992
1974	95.9301910400391
1975	96.2583694458008
1976	96.2177886962891
1977	96.1120071411133
1978	95.9154434204102
1979	96.269401550293
1980	96.4807434082031
1981	96.4330673217773
1982	96.3728790283203
1983	96.4018020629883
1984	96.4258804321289
1985	96.453010559082
1986	96.394172668457
1987	96.2668762207031
1988	95.6065368652344
1989	94.5283279418945
1990	95.2543334960938
1991	95.8246078491211
1992	95.5553283691406
1993	96.338623046875
1994	93.9199981689453
1995	97.5663909912109
1996	94.8101806640625
1997	93.1506576538086
1998	97.6974411010742
1999	97.267219543457
2000	97.3263092041016
2001	97.2628021240234
2002	97.5847625732422
2003	97.7784423828125
2004	97.5919036865234
2005	97.1871871948242
2006	96.5939788818359
2007	96.5810470581055
2008	96.7638168334961
2009	98.350341796875
2010	97.5143814086914
2011	97.3785171508789
2012	97.042121887207
2013	97.2619171142578
2014	97.421272277832
2015	97.3445434570312
2016	96.1342926025391
2017	98.0793075561523
2018	98.1285171508789
2019	98.3794479370117
2020	98.6563110351562
2021	98.6416320800781