Usage History of 'proration'

The following chart shows how frequently 'proration' appeared in printed materials over time. For example, the word 'proration' occurred 6 times in books in 1600 and 2,165 times in 2008. From 1600 to 2008, the word 'proration' was used a total of 127,654 times in books scanned by Google. See Reference: Google Ngram project.

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