The International Monetary Fund (IMF) economic growth forecasts for the continent have been revised downwards, in line with a less rosy view of global economic performance.

In its latest report it says that growth in sub-Saharan Africa's economy this year "is expected to remain weak" at 3%, which is lower than forecast last year.

The continent's oil exporting countries - especially Angola and Nigeria - have been particularly hard hit by a fall in the oil price.

Forecasts have been dramatically revised downwards for Nigeria.

The economy is now expected to grow by 2.3% this year as opposed to 4.1%, a figure predicted by the IMF in January.

Drought has also had an impact on some countries, notably Ethiopia.

Last year it was one if the fastest growing economies in the world at 10.2%, but this year growth is forecast at 4.5%.

Ghana is one of the positive stories - with the economy due to grow at 4.5% this year.

The IMF says that Ghana is emerging from problems caused by power shortages.