Year	% of cohort
1960	55.406449
1961	55.845638
1962	56.285024
1963	56.628747
1964	57.141332
1965	57.298793
1966	57.866392
1967	58.322033
1968	58.798388
1969	59.534833
1970	59.897904
1971	60.453831
1972	60.955394
1973	60.778205
1974	61.461388
1975	61.881456
1976	62.23252
1977	62.476477
1978	62.58523
1979	62.845411
1980	62.4917
1981	62.430716
1982	62.763386
1983	63.082673
1984	63.561856
1985	63.889009
1986	64.043612
1987	64.374379
1988	65.872606
1989	66.027442
1990	66.048533
1991	65.533521
1992	62.088704
1993	61.406204
1994	62.29465
1995	63.073495
1996	62.329566
1997	63.809857
1998	65.693075
1999	66.753161
2000	67.720868
2001	68.203023
2002	69.562142
2003	70.552392
2004	71.522493
2005	72.228148
2006	73.132856
2007	73.379259
2008	74.107083
2009	74.829614
2010	74.581716
2011	75.470436
2012	75.780754
2013	76.573155
2014	77.257055
2015	77.680609
2016	78.08378
2017	78.523238
2018	78.967045
2019	79.631491
2020	74.66578
2021	80.6312
2022	80.325862