Usage History of 'proportional'

The following chart shows how frequently 'proportional' appeared in printed materials over time. For example, the word 'proportional' occurred 2 times in books in 1505 and 367,247 times in 2008. From 1505 to 2008, the word 'proportional' was used a total of 13,384,320 times in books scanned by Google. See Reference: Google Ngram project.

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