Thanks again to Pat Iacovone for the microfiche. Information on Fawcett Comics' annual sales of Nyoka from 1942 to the mid-1950s is taken from the book "Juvenile Delinquency" (from 1950).
CIRCULATION DATA
1942 - 251,435
1946 - 826,906
1947 - 3,302,614
1948 - 3,981,576
1949 - 3,334,152
1950 (First 6 months) - 1,360,200 (data digit missed during transcription; zero inserted
as best guess)