Usage History of 'cooperator'

The following chart shows how frequently 'cooperator' appeared in printed materials over time. For example, the word 'cooperator' occurred 4 times in books in 1687 and 2,471 times in 2008. From 1687 to 2008, the word 'cooperator' was used a total of 76,499 times in books scanned by Google. See Reference: Google Ngram project.

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