Usage History of 'retreats'

The following chart shows how frequently 'retreats' appeared in printed materials over time. For example, the word 'retreats' occurred 2 times in books in 1607 and 68,356 times in 2008. From 1607 to 2008, the word 'retreats' was used a total of 1,592,880 times in books scanned by Google. See Reference: Google Ngram project.

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