Usage History of 'qi'

The following chart shows how frequently 'qi' appeared in printed materials over time. For example, the word 'qi' occurred 2 times in books in 1515 and 80,397 times in 2008. From 1515 to 2008, the word 'qi' was used a total of 1,508,857 times in books scanned by Google. See Reference: Google Ngram project.

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