Year	% of cohort
1960	18.537469
1961	19.079136
1962	19.663305
1963	20.291262
1964	20.960447
1965	21.682494
1966	22.453508
1967	23.24647
1968	24.049327
1969	25.125586
1970	26.181799
1971	27.221037
1972	28.368467
1973	29.479809
1974	30.567484
1975	31.681617
1976	32.838346
1977	33.941634
1978	35.047503
1979	36.104242
1980	37.185906
1981	38.310534
1982	39.450174
1983	40.581368
1984	41.705281
1985	42.691438
1986	43.827962
1987	45.007066
1988	46.097178
1989	47.142506
1990	48.142185
1991	49.121104
1992	50.314958
1993	51.383657
1994	52.213966
1995	53.533225
1996	54.622031
1997	55.607172
1998	56.692573
1999	57.790768
2000	57.471736
2001	59.760803
2002	60.743162
2003	61.749276
2004	62.690504
2005	63.584546
2006	64.417874
2007	65.46092
2008	66.44108
2009	67.198385
2010	68.137201
2011	68.819781
2012	69.605007
2013	70.336188
2014	70.955686
2015	71.529373
2016	72.026426
2017	72.457076
2018	72.890809
2019	73.288371
2020	73.596743
2021	73.968716
2022	74.600827