Usage History of 'retrofits'

The following chart shows how frequently 'retrofits' appeared in printed materials over time. For example, the word 'retrofits' occurred 2 times in books in 1846 and 1,443 times in 2008. From 1846 to 2008, the word 'retrofits' was used a total of 31,991 times in books scanned by Google. See Reference: Google Ngram project.

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