What was the population of the Federation of Rhodesia and Nyasaland?

Question:

What was the population of the Federation of Rhodesia and Nyasaland?

It existed only from 1953-1963. I can't find anything online that lists the population of this country. Please list the population and the year it had that population. Thanks in advance.

Best Answer - Chosen by Asker: It had an estimated 7,000,000 in 1955 - according to the Historical Dictionary of the British Empire, by James Stuart Olson and Robert Shadle, p. 422.

Sorry, the above is the best I could locate.
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