Usage History of 'porphyria'

The following chart shows how frequently 'porphyria' appeared in printed materials over time. For example, the word 'porphyria' occurred 6 times in books in 1759 and 9,071 times in 2008. From 1759 to 2008, the word 'porphyria' was used a total of 343,069 times in books scanned by Google. See Reference: Google Ngram project.

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