Year	% of cohort
1960	36.180948
1961	36.856135
1962	37.641776
1963	38.572924
1964	39.567807
1965	40.590151
1966	41.633823
1967	42.698891
1968	43.706344
1969	44.652834
1970	45.546111
1971	46.326177
1972	46.890801
1973	47.541149
1974	47.951534
1975	48.220543
1976	48.433166
1977	47.367803
1978	48.881874
1979	49.134772
1980	49.443637
1981	49.764801
1982	50.118258
1983	50.524801
1984	50.973284
1985	51.463602
1986	52.015645
1987	52.707211
1988	53.473233
1989	54.264546
1990	55.09311
1991	55.849846
1992	56.582502
1993	57.284573
1994	57.893098
1995	58.41685
1996	58.867016
1997	59.301388
1998	59.737652
1999	60.152548
2000	60.583741
2001	60.994131
2002	61.288323
2003	61.480053
2004	61.539239
2005	61.502961
2006	61.407109
2007	61.300001
2008	61.290983
2009	61.373474
2010	61.595823
2011	61.880006
2012	62.203685
2013	62.553803
2014	62.936771
2015	63.344051
2016	63.733581
2017	64.110762
2018	64.5124
2019	65.077249
2020	65.04991
2021	65.395002
2022	65.748179