Usage History of 'unsolved'

The following chart shows how frequently 'unsolved' appeared in printed materials over time. For example, the word 'unsolved' occurred 2 times in books in 1648 and 41,596 times in 2008. From 1648 to 2008, the word 'unsolved' was used a total of 1,284,046 times in books scanned by Google. See Reference: Google Ngram project.

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