The Most Powerful Volcano Ever?

Power fu is measured by the amount of lava flow, which could be like steady and not that exciting. But i guess what i mean is, you could have a really powerful volcano, but it's just oozing kind of constantly. Only three cubic kilometers of stuff was blown off the top of the mountain. It's a pretty small event on sort of like the top list of volcanic eruptions in earth' history. However, so it's the deadliest and most economically destructive in u. History, but it's not actually that impressive.