Year	% of cohort
1960	55.539182
1961	56.522855
1962	57.385892
1963	58.413023
1964	59.098666
1965	59.672344
1966	60.085241
1967	60.966465
1968	61.674547
1969	62.334853
1970	62.920706
1971	63.609777
1972	64.519838
1973	65.227268
1974	65.97042
1975	66.493594
1976	67.102823
1977	68.363356
1978	69.308339
1979	69.966284
1980	70.612143
1981	71.156136
1982	71.825917
1983	72.571739
1984	73.444447
1985	74.1472
1986	74.846345
1987	75.531974
1988	76.335911
1989	76.98157
1990	77.626884
1991	78.305281
1992	78.835354
1993	79.496636
1994	80.100706
1995	80.66375
1996	81.33269
1997	81.918884
1998	82.495764
1999	81.418402
2000	83.618538
2001	84.170885
2002	84.686793
2003	85.178608
2004	85.672487
2005	86.138012
2006	86.537217
2007	86.980301
2008	87.326689
2009	87.70157
2010	87.984514
2011	87.904881
2012	88.653127
2013	89.242956
2014	89.569179
2015	89.766197
2016	89.907132
2017	90.346368
2018	90.757944
2019	91.051727
2020	89.282232
2021	89.281071
2022	91.568411