Usage History of 'tunnelling'

The following chart shows how frequently 'tunnelling' appeared in printed materials over time. For example, the word 'tunnelling' occurred 2 times in books in 1800 and 16,199 times in 2008. From 1800 to 2008, the word 'tunnelling' was used a total of 388,448 times in books scanned by Google. See Reference: Google Ngram project.

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