Usage History of 'graded'

The following chart shows how frequently 'graded' appeared in printed materials over time. For example, the word 'graded' occurred 4 times in books in 1590 and 113,608 times in 2008. From 1590 to 2008, the word 'graded' was used a total of 3,618,834 times in books scanned by Google. See Reference: Google Ngram project.

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