New Zealand, 6,000 from New Caledonia, 3,000 from Europe, 1,000 from North America, 1,000 from Japan. Tourism has been promoted, in part, by Vanuatu being the site of several reality-TV shows. The ninth season of the reality TV series Survivor was filmed on Vanuatu, entitled Survivor: Vanuatu—Islands of Fire. Two years later, Australia's Celebrity Survivor was filmed at the same location used by the US version. In mid-2002, the government stepped up efforts to boost tourism. Financial services are an important part of the economy. Vanuatu is a tax haven that until 2008 did not release account information to other governments or law-enforcement agencies. International pressure, mainly from Australia, influenced the Vanuatu government to begin adhering to international norms to improve transparency. In Vanuatu, there is no income tax, withholding tax, capital gains tax, inheritance tax, or exchange control. Many international ship-management companies choose to flag their ships under the Vanuatu flag, because of the tax benefits and favourable labour laws (Vanuatu is a full member of the International Maritime Organization and applies its international conventions). Vanuatu is recognised as a "flag of convenience" country. Several file-sharing groups, such as the providers of the KaZaA network of Sharman Networks and the developers of WinMX, have chosen to incorporate in Vanuatu to avoid regulation and legal challenges. In response to foreign concerns the government has promised to tighten regulation of its offshore financial centre. Vanuatu receives foreign aid mainly from Australia and New Zealand. Vanuatu became the 185th member of the World Intellectual Property Organization (WIPO) in December 2011. Raising cattle leads to beef production for export. One estimate in 2007 for the total value of cattle heads sold was 135 million vatu; cattle were first introduced into the area from Australia by British planter James Paddon. On average, each household has 5 pigs and 16 chickens, and while cattle are the "most important livestock", pigs and chickens are important for subsistence agriculture as well as playing a significant role in ceremonies and customs (especially pigs). There are 30 commercial farms (sole proprietorships (37%), partnerships (23%), corporations (17%)), with revenues of 533 million vatu and expenses of 329 million vatu in 2007. Earthquakes can negatively affect economic activity on the island nation. A severe earthquake in November 1999, followed by a tsunami, caused extensive damage to the northern island of Pentecost, leaving thousands homeless. Another powerful earthquake in January 2002 caused