Sentence:  'What's different now,' said Grove, 'is that the landscape of the city has changed again, as inevitably it does, and the number of people who want a production from the Manhattan Theatre Club has grown sort of <WSD>quantumly</WSD>[.]' 
Meaning of the word marked with <WSD> tags:  Involving a massive increase, especially over a short time or seemingly at once; in one giant leap forwards.