Usage History of 'exogenous'

The following chart shows how frequently 'exogenous' appeared in printed materials over time. For example, the word 'exogenous' occurred 2 times in books in 1637 and 88,587 times in 2008. From 1637 to 2008, the word 'exogenous' was used a total of 2,906,079 times in books scanned by Google. See Reference: Google Ngram project.

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