Usage History of 'plugging'

The following chart shows how frequently 'plugging' appeared in printed materials over time. For example, the word 'plugging' occurred 4 times in books in 1723 and 29,239 times in 2008. From 1723 to 2008, the word 'plugging' was used a total of 760,116 times in books scanned by Google. See Reference: Google Ngram project.

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