and fuels. In contrast, mining activity is very low. Although manganese mining halted in 1978, there was an agreement in 2006 to export manganese already mined but not yet exported. The country has no known petroleum deposits. A small light-industry sector caters to the local market. Tax revenues come mainly from import duties and a 15% VAT on goods and services. Economic development is hindered by dependence on relatively few commodity exports, vulnerability to natural disasters, and long distances between constituent islands and from main markets. Agriculture is used for consumption as well as for export. It provides a living for 65% of the population. In particular, production of copra and kava create substantial revenue. Many farmers have been abandoning cultivation of food crops, and use earnings from kava cultivation to buy food. Kava has also been used in ceremonial exchanges between clans and villages. Cocoa is also grown for foreign exchange. In 2007, the number of households engaged in fishing was 15,758, mainly for consumption (99%), and the average number of fishing trips was 3 per week. The tropical climate enables growing of a wide range of fruits and vegetables and spices, including banana, garlic, cabbage, peanuts, pineapples, sugarcane, taro, yams, watermelons, leaf spices, carrots, radishes, eggplants, vanilla (both green and cured), pepper, cucumber and many others. In 2007, the value (in terms of millions of vatu – the official currency of Vanuatu), for agricultural products, was estimated for different products: kava (341 million vatu), copra (195), cattle (135), crop gardens (93), cocoa (59), forestry (56), fishing (24) and coffee (12). In 2018, Vanuatu banned all use of plastic bags and plastic straws, with more plastic items scheduled to be banned in 2020. Tourism brings in much-needed foreign exchange. Vanuatu is widely recognised as one of the premier vacation destinations for scuba divers wishing to explore coral reefs of the South Pacific region. A further significant attraction to scuba divers is the wreck of the US ocean liner and converted troop carrier SS President Coolidge on Espiritu Santo island. Sunk during World War II, it is one of the largest shipwrecks in the world that is accessible for recreational diving. Tourism increased 17% from 2007 to 2008 to reach 196,134 arrivals, according to one estimate. The 2008 total is a sharp increase from 2000, in which there were only 57,000 visitors (of these, 37,000 were from Australia, 8,000 from