How many times have you heard that "most" of the attacks are happening in "just four" provinces of Iraq. When they say "most" they mean "some number slightly greater than 50%". The deception comes when you realize that the populations of those four provinces is greater than 40% of the total.
From the census done recently by the Ministries of Trade and Planning. Baghdad: 6.38M, alAnbar 1.28M, Salahaddin 1.08M, Ninawa 1.37M, total 27.474M.