This was compared to the country’s previous ranking, in fifth place, last year.
Mauritius ranked first, followed by Cabo Verde, and Botswana ranked third in this year’s index.
The IIAG found that overall governance on the continent improved between 2009 and 2013, the Mo Ibrahim Foundation said on Monday.
“Africa is progressing but the story is complex and doesn’t fit the stereotypes,” chairman Mo Ibrahim said in a statement.
“Even if the overall picture looks good, we must all remain vigilant and not get complacent.”
The IIAG revealed that in the continent overall, between 2009 and 2013, progress was driven in the categories of participation and human rights, and human development.
The previous period, from 2005 to 2009, the main driver was sustainable economic opportunity, which stalled between 2009 and 2013.