Staple Foods Value Chain Analysis- Country Report Burundi. Burundi’s economy depends predominantly on the agriculture sector which, since 2005 has accounted for nearly 50% of the GDP. Agriculture employs about 92% of the population, compared to 3% employed in industry and 5% in the tertiary sector. The sector provides 95% of the food supply and raw materials and more than 90% of the export earnings. The food crops sub-sector accounts for up to 25% of GDP, while export crops represent only 1% of the GDP.