Year	% of cohort
1960	77.808689
1961	78.938696
1962	78.503915
1963	79.265347
1964	80.830671
1965	81.265519
1966	81.277383
1967	80.613255
1968	81.287692
1969	80.92438
1970	81.766039
1971	81.612058
1972	81.60254
1973	82.281705
1974	82.170964
1975	82.252394
1976	82.467887
1977	82.07366
1978	82.087425
1979	82.566755
1980	82.620619
1981	82.943796
1982	82.465244
1983	83.015036
1984	82.779865
1985	82.706684
1986	83.432274
1987	83.296566
1988	83.278366
1989	83.654493
1990	83.25071
1991	83.03688
1992	82.867593
1993	83.555525
1994	83.145541
1995	83.080347
1996	82.94813
1997	81.760397
1998	83.081694
1999	83.501108
2000	83.304842
2001	83.964353
2002	84.231334
2003	84.722519
2004	84.843557
2005	84.807181
2006	84.767893
2007	85.222539
2008	85.681308
2009	85.907692
2010	85.974668
2011	86.199004
2012	86.605587
2013	87.123365
2014	85.941617
2015	86.276913
2016	86.217184
2017	86.228139
2018	86.190437
2019	86.769813
2020	85.353759
2021	82.310032
2022	81.667078