Usage History of 'tranquilizers'

The following chart shows how frequently 'tranquilizers' appeared in printed materials over time. For example, the word 'tranquilizers' occurred 6 times in books in 1838 and 9,436 times in 2008. From 1838 to 2008, the word 'tranquilizers' was used a total of 606,952 times in books scanned by Google. See Reference: Google Ngram project.

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