"Unprecedented growth" refers to a situation where something is growing or expanding at a rate or scale that has never been seen before. Full definition
A decade of unprecedented growth in the rental housing market may be coming to an end. (jchs.harvard.edu)
It was this ability to provide a full range of organic products to the small natural foods stores and produce distributors that caused the company to experience unprecedented growth. (rainbowvalleyorchards.com)
And, of course, after cryptocurrencies across the board saw unprecedented growth in value last year, blockchain is the word on everyone's lips this year. (investinblockchain.com)