Usage History of 'backlog'

The following chart shows how frequently 'backlog' appeared in printed materials over time. For example, the word 'backlog' occurred 2 times in books in 1708 and 21,808 times in 2008. From 1708 to 2008, the word 'backlog' was used a total of 635,544 times in books scanned by Google. See Reference: Google Ngram project.

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