In ancient times the Maldives were renowned for cowry shells, coir rope, dried tuna fish (Maldive Fish), ambergris (Maavaharu), and coco de mer (Tavakkaashi). Local and foreign trading ships used to load these products in Sri Lanka and transport them to other harbours in the Indian Ocean. Historically Maldives provided enormous quantities of cowry shells, an international currency of the early ages. From the 2nd century AD the islands were known as the 'Money Isles' by the Arabs. Monetaria moneta were used for centuries as a currency in Africa, and huge amounts of Maldivian cowries were introduced into Africa by western nations during the period of slave trade. The cowry is now the symbol of the Maldives Monetary Authority. The Maldivian government began an economic reform program in 1989, initially by lifting import quotas and opening some exports to the private sector. Subsequently, it has liberalised regulations to allow more foreign investment. Real GDP growth averaged over 7.5% per year for more than a decade. Today, the Maldives' largest industry is tourism, accounting for 28% of GDP and more than 60% of the Maldives' foreign exchange receipts. Fishing is the second leading sector. The Maldivian economy is to a large degree based on tourism. In late December 2004, the major tsunami left more than 100 dead, 12,000 displaced, and property damage exceeding $400 million. As a result of the tsunami, the GDP contracted by about 3.6% in 2005. A rebound in tourism, post-tsunami reconstruction, and development of new resorts helped the economy recover quickly and showed an 18% increase on 2006. 2013 estimates show Maldivians enjoy the highest GDP (PPP) per capita $11,900 (2013 est) among south Asian countries. Agriculture and manufacturing continue to play a lesser role in the economy, constrained by the limited availability of cultivable land and the shortage of domestic labour. Tourism gave a major boost to the country's fledgling traditional cottage industries such as mat weaving, lacquer work, handicraft, and coir rope making. New industries that have since emerged include printing, production of PVC pipes, brick making, marine engine repairs, bottling of aerated water, and garment production.