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The U.S. has conducted the equivalent of one nuclear weapons test every 17 days since its first test; the Soviet Union has tested on average every 23 days; France every 63 days; Britain every 349 days and; China every 222 days. India has conducted only one test so far.
source: History of Nuclear Testing
It is estimated that the total yield of all the atmospheric nuclear weapons tests conducted is 438 megatons. That's equivalent to 29,200 Hiroshima size bombs. In the 36 years between 1945 and 1980 when atmospheric testing was being conducted this would have been equivalent to exploding a Hiroshima size bomb in the atmosphere every 11 hours.