Year	% of cohort
1960	30.050707
1961	30.496555
1962	30.986356
1963	31.333213
1964	31.908424
1965	32.134334
1966	32.482609
1967	32.785145
1968	33.081104
1969	33.22693
1970	33.719484
1971	34.118491
1972	34.486927
1973	34.935511
1974	35.576903
1975	36.291553
1976	36.955823
1977	37.895283
1978	38.057891
1979	38.581405
1980	38.73073
1981	38.955726
1982	39.506377
1983	39.995068
1984	40.704543
1985	41.381026
1986	42.097699
1987	42.983273
1988	43.893308
1989	43.692677
1990	45.749143
1991	47.033796
1992	48.72648
1993	49.59449
1994	50.874625
1995	51.843581
1996	53.263644
1997	54.141719
1998	52.707657
1999	46.969422
2000	54.6316
2001	57.223369
2002	57.882249
2003	59.020514
2004	59.598767
2005	61.04111
2006	62.573475
2007	63.416027
2008	64.078194
2009	65.630483
2010	66.408152
2011	67.789118
2012	68.311992
2013	68.677436
2014	69.900645
2015	70.55308
2016	71.070144
2017	71.42594
2018	72.454017
2019	72.739505
2020	72.734873
2021	71.238941
2022	71.278972