Usage History of 'researched'

The following chart shows how frequently 'researched' appeared in printed materials over time. For example, the word 'researched' occurred 4 times in books in 1653 and 99,503 times in 2008. From 1653 to 2008, the word 'researched' was used a total of 1,720,105 times in books scanned by Google. See Reference: Google Ngram project.

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