Year	% of cohort
1960	31.936423
1961	32.201311
1962	32.249493
1963	32.649684
1964	33.025757
1965	32.558276
1966	33.289384
1967	33.692904
1968	34.086032
1969	34.581268
1970	35.039167
1971	34.065479
1972	36.119266
1973	35.941831
1974	35.69348
1975	35.670934
1976	36.700231
1977	37.032341
1978	37.312357
1979	37.8611
1980	38.31657
1981	39.135139
1982	39.870655
1983	41.032386
1984	41.331014
1985	41.472745
1986	41.925413
1987	41.364884
1988	41.556461
1989	41.794582
1990	41.654866
1991	41.007529
1992	40.917441
1993	40.633463
1994	40.647537
1995	40.876074
1996	41.384779
1997	41.499271
1998	41.393918
1999	41.398736
2000	41.645844
2001	41.897719
2002	41.806385
2003	42.041342
2004	42.270858
2005	42.048504
2006	42.26672
2007	42.969486
2008	43.277264
2009	43.199471
2010	43.804181
2011	44.498631
2012	45.351706
2013	45.723108
2014	46.404539
2015	47.162156
2016	47.302931
2017	47.904712
2018	48.765319
2019	49.657066
2020	47.982932
2021	47.194982
2022	47.92527