Year	% of cohort
1960	33.698764
1961	34.194683
1962	34.853992
1963	35.053108
1964	35.527222
1965	36.194375
1966	36.111653
1967	36.703483
1968	37.34383
1969	37.405053
1970	37.885183
1971	38.502087
1972	38.575325
1973	38.846119
1974	38.93284
1975	39.552803
1976	39.081098
1977	39.682991
1978	40.128449
1979	40.939129
1980	42.367954
1981	43.318044
1982	44.106224
1983	44.943616
1984	45.903948
1985	46.75431
1986	47.672942
1987	48.396953
1988	49.471698
1989	50.438258
1990	51.130161
1991	52.184008
1992	53.019131
1993	53.74336
1994	54.103412
1995	55.121149
1996	55.905563
1997	56.631063
1998	57.190865
1999	56.940614
2000	57.905895
2001	59.302232
2002	60.131517
2003	61.346877
2004	61.862599
2005	63.155507
2006	64.073177
2007	65.037367
2008	65.426794
2009	66.960601
2010	68.225433
2011	68.930457
2012	70.337977
2013	70.77258
2014	72.34029
2015	72.622823
2016	73.777917
2017	73.893691
2018	74.018481
2019	75.24254
2020	75.797517
2021	74.674924
2022	76.490355