Year	% of cohort
1960	32.443552
1961	32.558646
1962	32.939209
1963	33.255263
1964	33.621404
1965	34.162819
1966	34.574163
1967	34.958499
1968	35.734277
1969	36.381662
1970	37.120767
1971	36.589264
1972	38.195888
1973	38.88282
1974	39.409441
1975	40.025557
1976	40.14336
1977	40.702985
1978	41.298638
1979	41.926357
1980	42.516275
1981	42.847901
1982	43.714436
1983	44.24893
1984	44.904773
1985	45.452369
1986	45.824071
1987	46.417137
1988	46.9178
1989	47.010453
1990	47.029824
1991	45.218135
1992	42.238627
1993	47.32654
1994	46.991223
1995	48.428039
1996	48.156421
1997	47.692906
1998	48.375087
1999	48.383412
2000	48.943213
2001	49.30017
2002	49.891804
2003	50.206525
2004	50.650449
2005	50.843098
2006	51.768419
2007	51.684529
2008	52.369737
2009	52.988383
2010	53.635202
2011	53.881453
2012	54.089528
2013	55.096778
2014	54.986306
2015	55.648764
2016	55.991284
2017	56.692481
2018	57.028996
2019	57.106683
2020	55.165761
2021	54.268641
2022	55.250868