Usage History of 'declassify'

The following chart shows how frequently 'declassify' appeared in printed materials over time. For example, the word 'declassify' occurred 4 times in books in 1899 and 1,082 times in 2008. From 1899 to 2008, the word 'declassify' was used a total of 17,192 times in books scanned by Google. See Reference: Google Ngram project.

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