- *Except Djibouti (2015), Eritrea (2011), Libya (2011) and South Sudan (2015) Source: World Bank 
- **Except Eritrea (2011) Source: World Bank
- Put two N/A (South Africa and Egypt) as highest category 
- Put two N/A as lowest category 
- Split 10/11/10 
- Split 10/11/10 
- Split 11/12/11 
- Split 10/11/10