Usage History of 'clean'

The following chart shows how frequently 'clean' appeared in printed materials over time. For example, the word 'clean' occurred 4 times in books in 1507 and 1,765,726 times in 2008. From 1507 to 2008, the word 'clean' was used a total of 35,446,418 times in books scanned by Google. See Reference: Google Ngram project.

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