Africa’s economic growth is forecast to rise to about 4% this year and next from 3.4% in 2019, driven by infrastructure investments and natural resource exports, the African Development Bank (AfDB) said on Thursday. Growth last year was below the average 5% rate of the past decade, the AfDB said in an annual report, due to slower growth in the continent's "big five" economies -- Algeria, Egypt, Morocco, Nigeria and South Africa.