private sector, upgrading agricultural productivity, revitalising the squash and vanilla-bean industries, developing tourism, and improving communications and transport. Substantial progress has been made, but much work remains to be done. A small, growing construction sector is developing in response to the inflow of aid money and remittances from Tongans abroad. In recognition of such a crucial contribution, the government has created a new department in the Prime Minister's Office with the purpose of catering for the needs of Tongans living abroad. In 2007, the Tongan Parliament amended citizenship laws to allow Tongans to hold dual citizenship. The tourist industry is relatively undeveloped. The government recognises that tourism can play a major role in economic development, and efforts are being made to increase this source of revenue. Cruise ships often stop in Vavaʻu, with a reputation for its whale watching, game fishing, surfing, beaches, and is increasingly becoming a major player in the South Pacific tourism market. Tonga's postage stamps, featuring colourful and often unusual designs (including heart-shaped and banana-shaped stamps), are popular with philatelists. In 2005, the country became eligible to become a member of the World Trade Organization. After an initial voluntary delay, Tonga became a full member of the WTO on 27 July 2007. The Tonga Chamber of Commerce and Industry, incorporated in 1996, endeavours to represent the interests of its members, private sector businesses, and to promote economic growth in the Kingdom. Tonga is home to some 106,000 people. More than double that number live overseas, mainly in the US, New Zealand, and Australia. Remittances from the overseas population have been declining since the onset of the 2008 global economic crisis. The tourism industry is improving, but remains modest at under 90,000 tourists per year. Agriculture In Tonga, agriculture and forestry (together with fisheries) provide the majority of employment, foreign exchange earnings, and food. Rural Tongans rely on both plantation and subsistence agriculture. Plants grown for both market cash crops and home use include bananas, coconuts, coffee beans, vanilla beans, and root crops such as cassava, sweet potato, and taro. , two-thirds of agricultural land was in root crops. The processing of coconuts into copra and desiccated (dried) coconut was once the only significant industry, and only commercial export. Deteriorating prices on the world market and lack of replanting brought this once vibrant industry, as in most island nations of the South Pacific, to a complete standstill.