Sub-Saharan Africa may be one of the fastest growing regions in the world, but few African economies are expanding in a way that will lead to sustainable, widespread prosperity, according to the World Economic Forum’s (WEF) latest ranking of countries by a wide measure of productivity.

In the annual global competitiveness list (pdf), released this week, 15 out of the 20 lowest ranked economies were in sub-Saharan Africa. Only three countries—Mauritius, South Africa, and Rwanda—were ranked above 70th place, out of 140 countries. The index looks at factors including progress on infrastructure, financial markets, ease of doing business, and technological gains.

Top 10 countries for global competitiveness Switzerland 1 Singapore 2 United States 3 Germany 4 Netherlands 5 Japan 6 Hong Kong 7 Finland 8 Sweden 9 United Kingdom 10

Lowest 10 countries for global competitiveness Myanmar 131 Venezuela 132 Mozambique 133 Haiti 134 Malawi 135 Burundi 136 Sierra Leone 137 Mauritania 138 Chad 139 Guinea 140

The region averaged over 5% yearly growth over the past 15 years, but much of that has been driven by selling off its natural resources—Africa is home to a third of the world’s minerals as well as a tenth of its oil. So far, this kind of growth hasn’t translated into a healthier, more educated work force, better productivity, or more reliable government institutions—all factors that affect an economy’s competitiveness, according to the WEF.

The report, which combines over 100 indicators measuring productivity, attributes this year’s poor performance to inadequate infrastructure, weak government institutions, and lagging health and education sectors. Falling commodity prices and growing investor caution toward emerging markets also haven’t helped.

It isn’t all bad news. The region is still expected to expand 4.2% this year and commodities are playing less of a role in some of its largest economies, like Nigeria, where services now account for 60% of GDP. Mauritius ranks 28th on the World Bank’s ranking of countries according to ease of doing business there, which also noted that no region had done more to improve regulation than sub-Saharan Africa.

Several countries are instituting structural reforms that are paying off. Côte d’Ivoire’s remarkable recovery after two civil wars has helped it jump 24 places to 91st rank, while Ethiopia also moved up nine spots. Chad and Guinea, this year’s lowest ranked, also moved up four rankings from last year.

Here is how the rankings look across the continent.