Usage History of 'insanity'

The following chart shows how frequently 'insanity' appeared in printed materials over time. For example, the word 'insanity' occurred 2 times in books in 1524 and 185,896 times in 2008. From 1524 to 2008, the word 'insanity' was used a total of 4,894,268 times in books scanned by Google. See Reference: Google Ngram project.

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