Crude oil futures rose more than 2% Tuesday, after President Donald Trump called for the evacuation of Tehran as Israel and Iran traded strikes for a fifth day.The U.S. crude oil contract for July delivery increased $1.

U.S. and global benchmark oil prices have seen their share of big moves since Israel launched attacks on Iran late last week. But there’s one indicator that helps put into perspective just how worried investors have become about the potential scope of the conflict.