Usage History of 'crazy'

The following chart shows how frequently 'crazy' appeared in printed materials over time. For example, the word 'crazy' occurred 4 times in books in 1520 and 621,219 times in 2008. From 1520 to 2008, the word 'crazy' was used a total of 10,438,004 times in books scanned by Google. See Reference: Google Ngram project.

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