Usage History of 'protrade'

The following chart shows how frequently 'protrade' appeared in printed materials over time. For example, the word 'protrade' occurred 2 times in books in 1813 and 104 times in 2008. From 1813 to 2008, the word 'protrade' was used a total of 3,900 times in books scanned by Google. See Reference: Google Ngram project.

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