https://en.wikipedia.org/wiki/Qira%27at
http://www.answering-islam.org/Green/seven.htm
http://www.answering-islam.org/PQ/A1.htm#AppendA
Algeria 41 Morocco 33 Tunisia 11 West Africa 363 Sudan 40 Libya 7 Tunisia 11 Qatar 3 Yemen 28 total 537 millions total muslims 1.8 billions