We can do this by adding the number of births for each age group:
Under 20: 392,000
20-29: 467,000 + 431,000 + 397,000 = 1,295,000
30-35: 460,000
36-38: 377,000
39-41: 341,000
42-44: 274,000
45-47: 255,000
48-50: 73,000 + 107,000 + 101,000 = 281,000
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