Industry employs one-eighth of Cameroon's work-force and contributed 22 percent of its GDP in 1997. Cameroon has gradually developed a range of industrial ventures aimed mainly at domestic and regional markets. Many of these industries are based in the port city of Douala, the country's industrial capital, and have benefited from Cameroon's geographic position and its low energy prices. The development of petroleum reserves has been accompanied by the construction of light refineries. Cameroon has also developed the manufacture of several light consumer goods that tend to replace more expensive imports. These include batteries, pasta, palm oil, beverages, cigarettes, and textiles. The cement industry supplies the country's booming construction sector as well as some promising neighboring markets.