 In 1928 King Albert I visited the Congo to inaugurate the so-called 'voie national' that linked the Katanga mining region via rail (up to Port Francqui) and via river transport (from Port Francqui to Léopoldville) to the Atlantic port of Matadi.The Great Depression of the 1930s affected the export-based Belgian Congo economy severely because of the drop in international demand for raw materials and agricultural products (for example, the price of peanuts fell from 1.25 francs to 25 centimes (cents)).In some areas, as in the Katanga mining region, employment declined by 70%.