Usage History of 'koan'

The following chart shows how frequently 'koan' appeared in printed materials over time. For example, the word 'koan' occurred 2 times in books in 1685 and 6,506 times in 2008. From 1685 to 2008, the word 'koan' was used a total of 199,196 times in books scanned by Google. See Reference: Google Ngram project.

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