Usage History of 'pigging'

The following chart shows how frequently 'pigging' appeared in printed materials over time. For example, the word 'pigging' occurred 2 times in books in 1692 and 1,287 times in 2008. From 1692 to 2008, the word 'pigging' was used a total of 30,809 times in books scanned by Google. See Reference: Google Ngram project.

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