Usage History of 'roofies'

The following chart shows how frequently 'roofies' appeared in printed materials over time. For example, the word 'roofies' occurred 2 times in books in 1976 and 462 times in 2008. From 1976 to 2008, the word 'roofies' was used a total of 5,664 times in books scanned by Google. See Reference: Google Ngram project.

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