Usage History of 'graders'

The following chart shows how frequently 'graders' appeared in printed materials over time. For example, the word 'graders' occurred 4 times in books in 1711 and 60,677 times in 2008. From 1711 to 2008, the word 'graders' was used a total of 1,478,203 times in books scanned by Google. See Reference: Google Ngram project.

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