Year	% of cohort
1960	34.987086
1961	36.645345
1962	38.144687
1963	39.860725
1964	41.192748
1965	42.571522
1966	44.151062
1967	44.612257
1968	45.157732
1969	46.040242
1970	46.574684
1971	46.363663
1972	46.307634
1973	47.232719
1974	48.77423
1975	51.227302
1976	52.796459
1977	54.537187
1978	56.066922
1979	57.160157
1980	58.321793
1981	58.101645
1982	57.974456
1983	57.456677
1984	56.803863
1985	57.71537
1986	58.282604
1987	59.067535
1988	59.725691
1989	60.032676
1990	60.554662
1991	60.523635
1992	60.762822
1993	60.433739
1994	60.027372
1995	57.31146
1996	59.87853
1997	60.221062
1998	61.393515
1999	61.827353
2000	62.35327
2001	64.953525
2002	65.923772
2003	66.868196
2004	67.177595
2005	68.841217
2006	67.264776
2007	67.657881
2008	67.913262
2009	67.975605
2010	69.091131
2011	70.72148
2012	72.457365
2013	72.467216
2014	72.874821
2015	71.603851
2016	73.687253
2017	75.272693
2018	73.607101
2019	73.901907
2020	71.319418
2021	69.713767
2022	71.336331