Usage History of 'methane'

The following chart shows how frequently 'methane' appeared in printed materials over time. For example, the word 'methane' occurred 4 times in books in 1702 and 97,100 times in 2008. From 1702 to 2008, the word 'methane' was used a total of 2,689,306 times in books scanned by Google. See Reference: Google Ngram project.

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