Usage History of 'pyrethroid'

The following chart shows how frequently 'pyrethroid' appeared in printed materials over time. For example, the word 'pyrethroid' occurred 4 times in books in 1945 and 2,938 times in 2008. From 1945 to 2008, the word 'pyrethroid' was used a total of 53,741 times in books scanned by Google. See Reference: Google Ngram project.

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