<Tr> <Td> Shona </Td> <Td> East Africa </Td> <Td> Zimbabwe and Mozambique </Td> <Td> Niger--Congo, Bantoid </Td> <Td> 15 (2000) </Td> </Tr> <Tr> <Td> Somali </Td> <Td> Horn of Africa </Td> <Td> Somalia, Djibouti, Ethiopia, Kenya </Td> <Td> Afro - Asiatic, Cushitic </Td> <Td> 20 (2009) </Td> </Tr> <Tr> <Td> Wolof </Td> <Td> West Africa </Td> <Td> Senegal, Gambia, Mauritania </Td> <Td> Niger - Congo, Atlantic </Td> <Td> </Td> </Tr> <Tr> <Td> Yoruba </Td> <Td> West Africa </Td> <Td> Nigeria, Benin, Togo, Ghana, Ivory Coast, Sierra Leone </Td> <Td> Niger--Congo, Volta--Niger </Td> <Td> 40 </Td> </Tr>

Where did the ethnic groups in west africa migrated from