Usage History of 'rats'

The following chart shows how frequently 'rats' appeared in printed materials over time. For example, the word 'rats' occurred 2 times in books in 1579 and 355,490 times in 2008. From 1579 to 2008, the word 'rats' was used a total of 13,005,569 times in books scanned by Google. See Reference: Google Ngram project.

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