Year	% of cohort
1960	34.870529
1961	34.882339
1962	34.805773
1963	34.67395
1964	34.407721
1965	33.96759
1966	34.228248
1967	34.306575
1968	34.360537
1969	34.899892
1970	35.30799
1971	35.524068
1972	36.185206
1973	36.576047
1974	36.850052
1975	37.367967
1976	37.492297
1977	38.003582
1978	38.519131
1979	39.161027
1980	40.031885
1981	41.237499
1982	42.297764
1983	42.9377
1984	43.670282
1985	44.321623
1986	44.582761
1987	44.123729
1988	44.073564
1989	43.981942
1990	43.514307
1991	43.389681
1992	41.532154
1993	40.469301
1994	40.952658
1995	38.495861
1996	35.721967
1997	32.719636
1998	29.392475
1999	26.578354
2000	23.761604
2001	21.147696
2002	18.857157
2003	17.026641
2004	15.450724
2005	14.713016
2006	13.926363
2007	13.934728
2008	14.589208
2009	15.262133
2010	16.637009
2011	18.502736
2012	20.501927
2013	22.77447
2014	25.161784
2015	27.533591
2016	29.664609
2017	31.452923
2018	32.915626
2019	33.975441
2020	34.271025
2021	29.953589
2022	30.385943