Sub-Saharan Africa is a geographical term used to describe the area of the African continent which lies south of the Sahara or those African countries which are fully or partially located south of the Sahara. Sub-Saharan Africa is rich in minerals. The region is a major exporter to the world of gold, uranium, chrome, vanadium, antimony, coltan, bauxite, iron ore, copper, and manganese. South Africa is a major exporter of manganese. Sub-saharan Africa produces 33% of the world's bauxite with Guinea the major supplier. Zambia is a major producer of copper. Sub-saharan Africa produces 49% of the world's diamonds. Agriculture has always been an integral activity in Sub-saharan Africa. Sub-saharan Africa has more variety of grains than anywhere in the world. Sub-Saharan Africa's growth performance during the past few years has been the best in more than three decades, and higher oil revenues and increased debt relief have been used to make progress toward the Millennium Development Goals (MDGs). Despite spending pressures, most countries have managed to preserve macroeconomic stability with policies intended to support and sustain the regions higher growth. African economies from Senegal to Benin to the Democratic Republic of Congo are more diversified.