President Jonathan is the 6th richest African president

According to the list, the richest president in Africa, Jose Eduardo dos Santos of Angola, is worth $20billion.
The 9 Richest African Presidents and Kings as of 2014:

9) Robert Mugabe – Net Worth: $10 Million
Country: Zimbabwe, Years in Power: 26
8) Idriss Deby – Net Worth: $50 Million
Country: Chad, Years in Power: 23
6) King Mswati III – Net Worth: $100 Million (tie with president Jonathan)
Country: Swaziland, Years in Power: 28


5) Paul Biya – Net Worth: $200 Million Country: Cameroon, Years in Power: 31
 
4) Uhuru Kenyatta – Net Worth: $500 Million
Country: Kenya, Years in Power: 1

3) Teodoro Obiang Nguema Mbasogo – $600 Million
Country: Equatorial Guinea, Years in Power: 34
 
2) Mohammed VI of Morocco – Net Worth: $2.5 Billion
Country: Morocco, Years in Power: 15
 
1) Jose Eduardo dos Santos – Net Worth: $20 Billion
Country: Angola, Years in Power: 34
 Richestlifestyle.com