Year	% of cohort
1960	30.935807
1961	31.052133
1962	31.367496
1963	31.431321
1964	31.816145
1965	31.859337
1966	32.181544
1967	32.405869
1968	33.149068
1969	33.931855
1970	34.417695
1971	35.167295
1972	35.94003
1973	36.706356
1974	36.952505
1975	37.531886
1976	38.294188
1977	39.190559
1978	39.84986
1979	40.739265
1980	41.009389
1981	41.288335
1982	41.498843
1983	41.466579
1984	41.30251
1985	41.316185
1986	41.462374
1987	41.336015
1988	41.548094
1989	40.779696
1990	40.308654
1991	39.396877
1992	38.453584
1993	38.177523
1994	37.583591
1995	37.688524
1996	37.50449
1997	37.493079
1998	37.821802
1999	38.759457
2000	39.536702
2001	40.279091
2002	40.896571
2003	42.555237
2004	43.446865
2005	44.40353
2006	44.867203
2007	45.519223
2008	46.361131
2009	47.861123
2010	49.384971
2011	50.826215
2012	52.662496
2013	54.138099
2014	55.922126
2015	57.693919
2016	59.401112
2017	60.892717
2018	62.122288
2019	62.99026
2020	61.462734
2021	60.908971
2022	61.858196