Usage History of 'shampoo'

The following chart shows how frequently 'shampoo' appeared in printed materials over time. For example, the word 'shampoo' occurred 2 times in books in 1706 and 36,008 times in 2008. From 1706 to 2008, the word 'shampoo' was used a total of 697,309 times in books scanned by Google. See Reference: Google Ngram project.

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