Upper middle income countries and West Africa
- Upper middle income countries- This group consists of 12 following countries: Algeria, Angola, Botswana, Brazil, China, Gabon, Libya, Mauritius, Namibia, Seychelles, South Africa, Tunisia. 
- West Africa- This group consists of 16 following countries: Benin, Burkina Faso, Cape Verde, Cote d'Ivoire, Ghana, Guinea, Guinea-Bissau, Liberia, Mali, Mauritania, Niger, Nigeria, Senegal, Sierra Leone, Gambia, Togo. 
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