The industrial sector, which includes mining, manufacturing, construction, and power, accounted for approximately 26 percent of gross domestic product in 2004 (including manufacturing, 16.2 percent; construction, 4.6 percent; and mining, 3.1 percent). More than 21 percent of the country's labor force was reported to be employed in this sector in 2002. The main industrial products are potash, phosphates, pharmaceuticals, cement, clothes, and fertilizers. The most promising segment of this sector is construction. In the past several years, demand has increased rapidly for housing and offices of foreign enterprises based in Jordan to better access the Iraqi market. The manufacturing sector has grown as well (to nearly 20 percent of GDP by 2005), in large part as a result of the United States–Jordan Free Trade Agreement (ratified in 2001 by the U.S. Senate); the agreement has led to the establishment of approximately 13 Qualifying Industrial Zones (QIZs) throughout the country. The QIZs, which provide duty-free access to the U.S. market, produce mostly light industrial products, especially ready-made garments. By 2004 the QIZs accounted for nearly US$1.1 billion in exports according to the Jordanian government.