Usage History of 'when'

The following chart shows how frequently 'when' appeared in printed materials over time. For example, the word 'when' occurred 52 times in books in 1505 and 70,727,337 times in 2008. From 1505 to 2008, the word 'when' was used a total of 1,519,734,200 times in books scanned by Google. See Reference: Google Ngram project.

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