Usage History of 'upgrading'

The following chart shows how frequently 'upgrading' appeared in printed materials over time. For example, the word 'upgrading' occurred 4 times in books in 1515 and 66,547 times in 2008. From 1515 to 2008, the word 'upgrading' was used a total of 1,759,073 times in books scanned by Google. See Reference: Google Ngram project.

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