The phrase "unprecedented number" means that something has never happened or been seen before in such a large amount or on such a large scale. Full definition
Although, I suppose it's possible that the nearly unprecedented number of wins by one film may actually cause the entire audience to spontaneously get up and start singing and dancing. (rowthree.com)
It will be said that paralegals in family law would be there to assist those clients who can not afford lawyers and are showing up in court in unprecedented numbers representing themselves. (slaw.ca)
Well, this year is seeing a nearly unprecedented number of films being picked up by indie and specialty studios in record numbers. (awardswatch.com)