how many african countries have experienced ethnic conflicts?

I am doin a research about ethnic conflicts in african countries...so using the "intense and moderate" rating, could anybody please help me rate these following african countries....

Algeria

Angola

Benin

Bostwana

Burkina Faso

Burundi

Cameroon

Cape Verde

Central African Republic

Chad

Comoros

Cote d' Ivoire

Djibouti

Egypt

Equatorial Guniea

Eritrea

Ethiopia

Gabon

Gambia

Ghana

Guinea

Guinea-Bissau

Kenya

Lesotho

Liberia

Libya

Madagascar

Malawi

Mali

Mauritania

Mauritius

Morocco

Mozambique

Namibia

Niger

Nigeria

Rwanda

Sao Tome & Principe

Senegal

Seychelles

Sierra Leone

Somalia

South Africa

Sudan

Swaziland

Tanzania

Togo

Tunisia

Uganda

Zambia

Zimbabwe

Thank you guys soo much

Amy