Usage History of 'subnational'

The following chart shows how frequently 'subnational' appeared in printed materials over time. For example, the word 'subnational' occurred 2 times in books in 1839 and 22,003 times in 2008. From 1839 to 2008, the word 'subnational' was used a total of 369,710 times in books scanned by Google. See Reference: Google Ngram project.

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