Usage History of 'proa'

The following chart shows how frequently 'proa' appeared in printed materials over time. For example, the word 'proa' occurred 2 times in books in 1564 and 3,029 times in 2008. From 1564 to 2008, the word 'proa' was used a total of 98,358 times in books scanned by Google. See Reference: Google Ngram project.

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