Year	% of cohort
1960	41.367982
1961	42.063831
1962	42.774039
1963	43.313425
1964	44.21756
1965	37.288788
1966	45.657812
1967	46.447908
1968	47.23408
1969	48.05813
1970	48.928326
1971	49.832235
1972	50.738303
1973	51.613628
1974	52.42574
1975	53.145877
1976	53.778684
1977	54.374588
1978	54.990585
1979	55.104356
1980	56.51944
1981	57.469126
1982	58.488874
1983	59.466009
1984	60.338753
1985	61.031465
1986	61.557545
1987	61.967689
1988	62.328648
1989	62.719481
1990	63.219609
1991	63.823031
1992	64.449531
1993	65.014343
1994	65.455548
1995	65.650187
1996	65.622078
1997	65.481712
1998	65.191269
1999	65.22027
2000	65.360548
2001	65.737499
2002	66.287095
2003	67.064255
2004	67.307283
2005	68.188347
2006	68.612333
2007	68.876975
2008	69.18653
2009	69.384847
2010	69.600264
2011	69.661636
2012	70.024407
2013	70.277075
2014	70.540047
2015	70.808001
2016	71.074935
2017	71.352903
2018	71.583689
2019	71.756008
2020	69.712952
2021	69.27367
2022	72.722113