The Organisation of Islamic Cooperation is an international organisation with 57 member states (the largest of the World outside the UN). The organisation is "the collective voice of the Muslim world" and works to "safeguard and protect the interests of the Muslim world in the spirit of promoting international peace and harmony.
Furthermore all countries from Middle East except Israel, and many countries from Africa and Asia, Albania in Europe, and Guyana and Surinam in South America, are also members.
Regarding the population these countries represent aprox the 22% of population of the world, the 5 members with more population by rounding figures are:
1.- Indonesia: 250.000.000
2.- Pakistan: 190.000.000
3.- Nigeria: 180.000.000
4.- Bangladesh: 156.000.000
5.- Egypt: 86.000.000
Regarding GDP in billion dollars represent aprox the 11% of the GDP of the world.
1.- Indonesia: GDP, 1.210
2.- Turkey: GDP, 1.110
3.- Iran: GDP, 1.006
4.- Saudi Arabia: GDP, 733
5.- Egypt: GDP, 533
Regarding GDP per capita.
1.- Qatar: $ 106.000
2.- UAE: $ 69.000
3.- Kuwait: $ 53.000
4.- Brunei: $ 40.000
5.- Oman: $ 24.000
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