Year	% of cohort
1960	32.835333
1961	33.242163
1962	33.425781
1963	33.793594
1964	34.256276
1965	34.668496
1966	35.182747
1967	35.808643
1968	36.554099
1969	37.148831
1970	37.847505
1971	39.227068
1972	40.42043
1973	41.956964
1974	43.464547
1975	45.195069
1976	46.661013
1977	48.022262
1978	45.162206
1979	50.916195
1980	52.25028
1981	53.332717
1982	54.645297
1983	55.824108
1984	57.083506
1985	58.710337
1986	59.996895
1987	61.266552
1988	62.619703
1989	63.841427
1990	65.139488
1991	66.52161
1992	67.788305
1993	69.207294
1994	70.579924
1995	72.30927
1996	74.042738
1997	74.997031
1998	75.516704
1999	76.641216
2000	77.994402
2001	80.277636
2002	81.919549
2003	83.432831
2004	82.469388
2005	85.325125
2006	85.990197
2007	86.744632
2008	87.785121
2009	88.523872
2010	89.205214
2011	89.757323
2012	90.366816
2013	90.983038
2014	91.435491
2015	91.744896
2016	91.938191
2017	92.198369
2018	92.275597
2019	92.402573
2020	92.624918
2021	92.621436
2022	92.880136