English speaking countries in Africa

How many countries in Africa have English as their official language?

• Botswana
• Cameroon (has both English and French as official languages)
• The Gambia
• Ghana
• Kenya (also Swahili)
• Lesotho
• Liberia
• Malawi
• Mauritius, a group of islands off Madagascar
• Namibia
• Nigeria
• Rwanda (has both English and French)
• St. Helena, an island in the South Atlantic
• Sierra Leone 
• South Africa (also Afrikaans and native languages)
• South Sudan
• Sudan (also Arabic)
• Swaziland
• Tanzania (also Swahili)
• Uganda (also Swahili)
• Zambia
• Zimbabwe

Update:  How many have Spanish as their official language?  The only one is Equatorial Guinea, as well as Spanish enclaves in Morocco (Ceuta and Melilla).