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https://books.google.com/ngrams/graph?content=exponential+growth&case_insensitive=on&year_start=1850&year_end=1976&corpus=18&smoothing=3&share=&direct_url=t4%3B%2Cexponential%20growth%3B%2Cc0%3B%2Cs0%3B%3Bexponential%20growth%3B%2Cc0%3B%3BExponential%20growth%3B%2Cc0%3B%3BExponential%20Growth%3B%2Cc0%3B%3BEXPONENTIAL%20GROWTH%3B%2Cc0