Year	% of cohort
1960	22.251565
1961	22.410815
1962	20.636149
1963	19.424157
1964	21.905335
1965	22.555285
1966	23.137341
1967	23.731362
1968	24.845122
1969	27.372529
1970	28.550613
1971	30.139105
1972	31.056383
1973	32.156717
1974	33.352424
1975	34.412711
1976	35.360461
1977	36.87491
1978	38.313263
1979	39.327061
1980	41.05125
1981	42.39335
1982	43.395231
1983	45.266138
1984	46.698726
1985	47.921306
1986	39.957069
1987	49.963017
1988	50.896407
1989	51.671606
1990	52.478144
1991	52.670372
1992	53.463983
1993	54.286333
1994	53.224244
1995	55.20553
1996	55.261004
1997	56.194084
1998	56.418776
1999	57.339988
2000	58.295372
2001	59.348474
2002	60.467579
2003	61.458539
2004	62.408611
2005	63.234183
2006	63.558135
2007	64.605107
2008	65.477784
2009	65.371989
2010	65.464226
2011	65.874716
2012	65.750796
2013	66.315545
2014	65.874721
2015	61.186114
2016	61.819511
2017	61.386782
2018	56.958525
2019	58.778173
2020	57.704862
2021	55.648933
2022	55.381005