Year	% of cohort
1960	36.544308
1961	37.163685
1962	37.456758
1963	33.114541
1964	38.941923
1965	34.260149
1966	30.155233
1967	30.800413
1968	31.391281
1969	30.484743
1970	31.09197
1971	37.732482
1972	38.78367
1973	45.495395
1974	45.724331
1975	46.019581
1976	46.033723
1977	46.418744
1978	46.392215
1979	46.496658
1980	46.57507
1981	46.663379
1982	47.217357
1983	35.348333
1984	32.303716
1985	32.544004
1986	38.962244
1987	22.680161
1988	11.453118
1989	33.56874
1990	34.0978
1991	34.909852
1992	26.276237
1993	27.398665
1994	48.965401
1995	37.835995
1996	38.08748
1997	38.918079
1998	30.289491
1999	47.825986
2000	50.263393
2001	50.295765
2002	50.946014
2003	48.880185
2004	45.40055
2005	46.28574
2006	53.265808
2007	54.839276
2008	54.69102
2009	57.378876
2010	58.28277
2011	58.471122
2012	59.236808
2013	58.392784
2014	59.356308
2015	60.457744
2016	60.618775
2017	61.943456
2018	62.310761
2019	62.641483
2020	61.760516
2021	60.906593
2022	61.400028