Usage History of 'hapkido'

The following chart shows how frequently 'hapkido' appeared in printed materials over time. For example, the word 'hapkido' occurred 6 times in books in 1966 and 233 times in 2008. From 1966 to 2008, the word 'hapkido' was used a total of 3,962 times in books scanned by Google. See Reference: Google Ngram project.

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