Usage History of 'toughness'

The following chart shows how frequently 'toughness' appeared in printed materials over time. For example, the word 'toughness' occurred 2 times in books in 1648 and 51,612 times in 2008. From 1648 to 2008, the word 'toughness' was used a total of 1,757,744 times in books scanned by Google. See Reference: Google Ngram project.

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