Usage History of 'passports'

The following chart shows how frequently 'passports' appeared in printed materials over time. For example, the word 'passports' occurred 4 times in books in 1515 and 67,891 times in 2008. From 1515 to 2008, the word 'passports' was used a total of 1,545,062 times in books scanned by Google. See Reference: Google Ngram project.

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