"The figures from the U.S. Central Command show a rate of one civilian death for every 200 strikes that U.S. planes have launched in Iraq and Syria.
That’s a vastly lower figure than the war in Afghanistan at its height — a rate of one dead civilian for about every 15 strikes — or during six years of counterterrorism strikes in countries including Pakistan and Yemen, where the White House in a recent study found that a civilian died for every four to seven strikes." Source.