Steel is concentrated in the port city of Chittagong, and the ceramics industry is prominent in international trade. In 2005 Bangladesh was the world's 20th-largest cement producer, an industry dependent on limestone imports from northeast India. Food processing is a major sector, with local brands such as PRAN increasing their international presence. The electronics industry is growing rapidly with contributions from companies like the Walton Group. Bangladesh's defense industry includes the Bangladesh Ordnance Factories and the Khulna Shipyard.