Usage History of 'filtering'

The following chart shows how frequently 'filtering' appeared in printed materials over time. For example, the word 'filtering' occurred 2 times in books in 1668 and 200,955 times in 2008. From 1668 to 2008, the word 'filtering' was used a total of 3,734,770 times in books scanned by Google. See Reference: Google Ngram project.

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