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In page Sperm whale:

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It is estimated that the historic worldwide population numbered 1,100,000 before commercial sperm whaling began in the early 18th century.[20][21] By 1880, it had declined by an estimated 29 percent.[20] From that date until 1946, the population appears to have partially recovered as whaling activity decreased, but after the Second World War, the population declined even further, to 33 per cent of the pre-whaling population.[citation needed] Between 184,000 and 236,000 sperm whales were killed by the various whaling nations in the 19th century,[22] while in the 20th century, at least 770,000 were taken, the majority between 1946 and 1980.[23]