Usage History of 'roofs'

The following chart shows how frequently 'roofs' appeared in printed materials over time. For example, the word 'roofs' occurred 2 times in books in 1563 and 211,498 times in 2008. From 1563 to 2008, the word 'roofs' was used a total of 4,909,117 times in books scanned by Google. See Reference: Google Ngram project.

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