Usage History of 'blockers'

The following chart shows how frequently 'blockers' appeared in printed materials over time. For example, the word 'blockers' occurred 6 times in books in 1719 and 71,438 times in 2008. From 1719 to 2008, the word 'blockers' was used a total of 1,309,308 times in books scanned by Google. See Reference: Google Ngram project.

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