USA economic engagement under the HOPE Act, from December 2006, increased apparel exports and investment by providing tariff-free access to the USA. HOPE II, in October 2008, further improved the situation by extending preferences to 2018. Haiti uses very little energy, the equivalent of approximately 250 kilograms of oil per head per year. In 2003, Haiti produced 546 million kilowatt-hours of electricity while consuming 508 million kilowatt-hours. In 2013, it stood 135th out of 135 countries in net total consumption of electricity. Most of the country's energy comes from the burning of wood. Haiti imports oil, consuming about , as of 2003. The Péligre Dam, the country's largest, provides the capital city of Port-au-Prince with energy. Thermal plants provide electricity to the rest of the country. Even with the country's low level of demand for energy, the supply of electricity traditionally has been sporadic and prone to shortages. Mismanagement by the state has offset more than US$100 million in foreign investment targeted at improving Haiti's energy infrastructure. Businesses have resorted to securing back-up power sources to deal with the regular outages. The potential for greater hydropower exists, should Haiti have the desire and means to develop it. The government controls oil and gas prices, to an extent insulating Haitians from international price fluctuations. Tertiary industries include the following:  Haiti's services sector made up 52 percent of the country's gross domestic product in 2004 and employed 25 percent of the labor force. According to World Bank statistics, the services sector is one of the few sectors of Haiti's economy that sustained steady, if modest, growth throughout the 1990s. Lack of a stable and trustworthy banking system has impeded Haiti's economic development. Banks in Haiti have collapsed on a regular basis. Most Haitians do not have access to loans of any sort. When reelected in 2000, President Aristide promised to remedy this situation but instead introduced a non-sustainable plan of "cooperatives" that guaranteed investors a 10 percent rate of return. By 2000, the cooperatives had crumbled and Haitians had collectively lost more than US$200 million in savings. Haiti's central bank, the Bank of the Republic of Haiti, oversees 10 commercial banks and two foreign banks operating in the country. Most banking takes place in the capital city of Port-au-Prince. The United Nations and the International Monetary Fund have led efforts to diversify and expand the finance sector, making credit more available to rural populations.