Tanzania is one of the poorest countries in the world. The economy depends heavily on agriculture, which accounts for about half of GDP, provides 85% of exports, and employs 80% of the work force. Topography and climatic conditions, however, limit cultivated crops to only 4% of the land area. Industry traditionally featured the processing of agricultural products and light consumer goods. The World Bank, the International Monetary Fund, and bilateral donors have provided funds to rehabilitate Tanzania's out-of-date economic infrastructure and to alleviate poverty. Growth in 1991-2002 featured a pickup in industrial production and a substantial increase in output of minerals, led by gold. Oil and gas exploration and development played an important role in this growth. Recent banking reforms have helped increase private sector growth and investment. Continued donor assistance and solid macroeconomic policies supported real GDP growth of more than 5.2% in 2004.