Usage History of 'piggybacking'

The following chart shows how frequently 'piggybacking' appeared in printed materials over time. For example, the word 'piggybacking' occurred 2 times in books in 1950 and 3,125 times in 2008. From 1950 to 2008, the word 'piggybacking' was used a total of 45,544 times in books scanned by Google. See Reference: Google Ngram project.

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