From the National Counterterrorism Center. Keep in mind, Obama administration, too. So there's no "BushHalliburtonCheyneyHitler" fudging the numbers to make it "look bad".
But hey, there's no reason to believe there's any relationship between Sunni Islam and terrorism. No. Hmmm-mmm. And those Christians. The ones that are "just as dangerous" -- yeah.