Year	% of cohort
1960	32.907218
1961	33.072556
1962	33.466382
1963	33.064766
1964	33.460807
1965	34.057581
1966	34.409985
1967	34.833643
1968	35.258355
1969	35.79271
1970	36.116509
1971	36.60789
1972	36.894992
1973	37.456568
1974	38.566704
1975	38.8903
1976	39.292942
1977	39.703156
1978	39.936873
1979	40.27798
1980	40.747993
1981	41.241171
1982	41.456995
1983	41.688303
1984	41.88122
1985	42.175072
1986	42.618138
1987	42.801424
1988	43.516494
1989	44.057531
1990	44.573353
1991	45.101716
1992	45.681853
1993	45.782467
1994	45.479815
1995	46.619347
1996	46.420556
1997	44.256635
1998	45.885375
1999	45.460126
2000	47.579729
2001	47.593213
2002	48.188982
2003	48.169637
2004	49.194178
2005	48.938006
2006	50.535493
2007	51.33472
2008	52.220404
2009	53.558106
2010	54.757574
2011	55.61286
2012	56.791507
2013	57.517307
2014	57.917723
2015	58.737153
2016	59.687208
2017	59.935714
2018	60.957674
2019	61.235659
2020	59.436584
2021	57.929886
2022	58.163591