Usage History of 'referred'

The following chart shows how frequently 'referred' appeared in printed materials over time. For example, the word 'referred' occurred 6 times in books in 1507 and 1,992,662 times in 2008. From 1507 to 2008, the word 'referred' was used a total of 56,063,834 times in books scanned by Google. See Reference: Google Ngram project.

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