According to Wiki:
Iraq is a Muslim-majority country; Islam accounts for an estimated 97% of the population, while non-Muslims account for just 3%.It has a mixed Shia and Sunni population. Most sources estimate that around 65% of Muslims in Iraq are Shia, and around 35% are Sunni.
Okay, I was going from memory. Shia’s make up around 20% of the world’s Islamic population, Sunni is around 75%.