Year	% of cohort
1960	31.092807
1961	31.439179
1962	31.82613
1963	31.894456
1964	30.832396
1965	30.881351
1966	30.583553
1967	30.731246
1968	30.756127
1969	30.918384
1970	30.959402
1971	30.936643
1972	30.097727
1973	30.383256
1974	31.470193
1975	32.746819
1976	32.712898
1977	32.718505
1978	32.858253
1979	32.738265
1980	32.753495
1981	29.433066
1982	29.588175
1983	29.709672
1984	21.295915
1985	21.515415
1986	23.428964
1987	23.319984
1988	32.392879
1989	32.747347
1990	33.098062
1991	33.144229
1992	33.432463
1993	33.987218
1994	34.181646
1995	34.248525
1996	34.754862
1997	35.234259
1998	35.542354
1999	36.099485
2000	36.436887
2001	36.765979
2002	36.824846
2003	36.920005
2004	37.079242
2005	37.183533
2006	37.450204
2007	37.673368
2008	38.101303
2009	38.971153
2010	39.31413
2011	40.179763
2012	41.135488
2013	42.42162
2014	43.578941
2015	44.941351
2016	46.397867
2017	47.975966
2018	48.932735
2019	50.224484
2020	48.720691
2021	43.266913
2022	44.559126