Usage History of 'laogai'

The following chart shows how frequently 'laogai' appeared in printed materials over time. For example, the word 'laogai' occurred 2 times in books in 1979 and 397 times in 2008. From 1979 to 2008, the word 'laogai' was used a total of 10,593 times in books scanned by Google. See Reference: Google Ngram project.

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