Usage History of 'efs'

The following chart shows how frequently 'efs' appeared in printed materials over time. For example, the word 'efs' occurred 1 time in books in 1664 and 6,814 times in 2008. From 1664 to 2008, the word 'efs' was used a total of 107,044 times in books scanned by Google. See Reference: Google Ngram project.

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