Year	% of cohort
1960	26.371217
1961	26.728892
1962	27.073117
1963	27.213618
1964	27.462561
1965	26.895414
1966	25.829537
1967	26.173053
1968	26.787376
1969	27.080664
1970	27.317614
1971	26.517914
1972	28.010463
1973	29.465166
1974	29.568166
1975	29.729464
1976	29.106381
1977	29.418103
1978	29.860145
1979	30.289056
1980	30.603679
1981	30.691056
1982	31.269176
1983	31.578146
1984	32.173808
1985	33.758506
1986	33.319763
1987	25.377165
1988	35.1272
1989	34.845611
1990	30.386394
1991	35.290929
1992	35.57735
1993	36.305433
1994	36.508914
1995	36.95955
1996	37.345743
1997	37.684807
1998	37.440639
1999	37.625913
2000	37.274921
2001	38.147109
2002	38.146971
2003	38.510654
2004	38.012713
2005	38.1066
2006	37.397196
2007	37.975734
2008	38.235283
2009	38.4763
2010	38.879891
2011	39.369448
2012	40.066217
2013	40.160253
2014	40.646128
2015	40.95669
2016	42.209537
2017	42.016823
2018	42.689986
2019	43.010705
2020	41.026449
2021	39.793507
2022	40.462422