Year	% of cohort
1960	39.610337
1961	40.330212
1962	40.814807
1963	41.519927
1964	41.936877
1965	42.448402
1966	42.949936
1967	43.605663
1968	44.240196
1969	45.047384
1970	45.854414
1971	46.679349
1972	47.175585
1973	47.926715
1974	48.701791
1975	48.897336
1976	49.565197
1977	49.762481
1978	50.39512
1979	50.802285
1980	51.515819
1981	52.211756
1982	52.149016
1983	52.720494
1984	53.205238
1985	53.716282
1986	54.560285
1987	55.209449
1988	55.385182
1989	55.406013
1990	55.33036
1991	55.447754
1992	54.807022
1993	54.623613
1994	54.449373
1995	54.062392
1996	54.023155
1997	53.866234
1998	54.701402
1999	55.183222
2000	56.041318
2001	56.191461
2002	56.455898
2003	56.881957
2004	57.143577
2005	57.209502
2006	57.794994
2007	58.697535
2008	60.040528
2009	61.229525
2010	61.904203
2011	62.470291
2012	63.045837
2013	63.049279
2014	62.526726
2015	63.016619
2016	63.44173
2017	63.64769
2018	63.244945
2019	63.529577
2020	63.064893
2021	64.255147
2022	64.07508