Usage History of 'zoo'

The following chart shows how frequently 'zoo' appeared in printed materials over time. For example, the word 'zoo' occurred 2 times in books in 1589 and 116,215 times in 2008. From 1589 to 2008, the word 'zoo' was used a total of 2,965,069 times in books scanned by Google. See Reference: Google Ngram project.

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