Year	% of cohort
1960	45.974635
1961	46.361048
1962	47.40773
1963	48.28601
1964	49.114513
1965	50.243916
1966	50.412736
1967	51.213449
1968	51.075562
1969	49.791641
1970	50.017363
1971	50.027122
1972	49.635622
1973	47.620816
1974	49.277511
1975	49.404509
1976	49.297956
1977	49.735872
1978	50.086338
1979	51.159588
1980	50.406053
1981	50.247776
1982	50.105191
1983	51.019187
1984	52.218859
1985	53.675677
1986	53.649949
1987	54.047052
1988	54.402796
1989	54.721876
1990	55.173123
1991	55.402817
1992	55.882185
1993	56.162587
1994	56.459756
1995	56.820503
1996	57.091975
1997	57.309658
1998	57.62617
1999	57.822391
2000	56.702051
2001	56.864213
2002	55.36426
2003	56.725486
2004	57.464171
2005	57.9965
2006	58.745545
2007	58.758681
2008	58.918103
2009	59.245907
2010	59.765431
2011	60.073604
2012	60.438438
2013	59.88621
2014	59.786012
2015	58.255214
2016	59.943142
2017	61.410524
2018	61.654739
2019	62.005472
2020	62.269542
2021	60.711497
2022	62.153149