Usage History of 'voucher'

The following chart shows how frequently 'voucher' appeared in printed materials over time. For example, the word 'voucher' occurred 4 times in books in 1635 and 51,160 times in 2008. From 1635 to 2008, the word 'voucher' was used a total of 1,280,233 times in books scanned by Google. See Reference: Google Ngram project.

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