Year	% of cohort
1960	77.472255
1961	78.020174
1962	78.307488
1963	78.450194
1964	78.850486
1965	79.193757
1966	79.485868
1967	79.559355
1968	79.608807
1969	79.848744
1970	79.869389
1971	80.08549
1972	80.171724
1973	80.453714
1974	80.7256
1975	81.186294
1976	81.95826
1977	81.934914
1978	82.100103
1979	82.60781
1980	82.99883
1981	83.709299
1982	82.920069
1983	84.55691
1984	85.255293
1985	85.713098
1986	85.663388
1987	86.402267
1988	86.948675
1989	87.69739
1990	88.30867
1991	88.19993
1992	88.247785
1993	88.948326
1994	89.326625
1995	89.368736
1996	90.082672
1997	90.245087
1998	90.50802
1999	90.696066
2000	91.009591
2001	91.467458
2002	91.321727
2003	91.675636
2004	92.081766
2005	92.07686
2006	92.229172
2007	92.361687
2008	92.643756
2009	92.973229
2010	93.100189
2011	92.993263
2012	92.997533
2013	93.222864
2014	93.312405
2015	93.325386
2016	93.425953
2017	93.697283
2018	93.779117
2019	93.777372
2020	93.750247
2021	93.697415
2022	93.803963