Year	% of cohort
1960	42.847437
1961	43.597495
1962	44.33917
1963	45.187696
1964	46.170369
1965	47.09615
1966	47.994045
1967	48.927442
1968	49.827378
1969	50.600478
1970	51.458786
1971	52.289473
1972	52.967098
1973	54.098421
1974	55.015455
1975	55.927131
1976	56.898408
1977	57.783357
1978	58.879018
1979	60.658351
1980	62.197789
1981	64.002047
1982	65.843563
1983	67.460424
1984	69.122951
1985	69.116701
1986	70.825291
1987	69.375946
1988	72.391818
1989	72.455239
1990	73.781438
1991	73.942182
1992	74.221334
1993	74.292808
1994	74.643077
1995	74.770628
1996	75.773243
1997	75.907866
1998	76.020224
1999	74.747776
2000	76.336304
2001	76.381526
2002	76.543015
2003	76.75527
2004	76.811619
2005	76.926246
2006	77.051375
2007	77.249893
2008	77.36679
2009	77.468627
2010	77.356476
2011	77.350955
2012	77.221429
2013	77.352108
2014	76.99498
2015	77.028459
2016	77.262648
2017	77.457167
2018	77.449258
2019	77.575293
2020	77.597803
2021	78.582965
2022	78.624828