result of differential foundation settlement. Economy As the capital of Uruguay, Montevideo is the economic and political center of the country. Most of the largest and wealthiest businesses in Uruguay have their headquarters in the city. Since the 1990s the city has undergone rapid economic development and modernization, including two of Uruguay's most important buildings—the World Trade Center Montevideo (1998), and Telecommunications Tower (2000), the headquarters of Uruguay's government-owned telecommunications company ANTEL, increasing the city's integration into the global marketplace. The Port of Montevideo, in the northern part of Ciudad Vieja, is one of the major ports of South America and plays a very important role in the city's economy. The port has been growing rapidly and consistently at an average annual rate of 14 percent due to an increase in foreign trade. The city has received a US$20 million loan from the Inter-American Development Bank to modernize the port, increase its size and efficiency, and enable lower maritime and river transportation costs. The most important state-owned companies headquartered in Montevideo are: AFE (railways), ANCAP (Energy), Administracion Nacional de Puertos (Ports), ANTEL (telecommunications), BHU (savings and loan), BROU (bank), BSE (insurance), OSE (water & sewage), UTE (electricity). These companies operate under public law, using a legal entity defined in the Uruguayan Constitution called Ente Autonomo ("autonomous entity"). The government also owns part of other companies operating under private law, such as those owned wholly or partially by the CND (National Development Corporation). Banking has traditionally been one of the strongest service export sectors in Uruguay: the country was once dubbed "the Switzerland of America", mainly for its banking sector and stability, although that stability has been threatened in the 21st century by the recent global economic climate. The largest bank in Uruguay is Banco Republica (BROU), based in Montevideo. 9 private banks, most of them branches of international banks, operate in the country (Banco Santander, BBVA, ABN AMRO, Citibank, among others). There are also a myriad of brokers and financial-services bureaus, among them Ficus Capital, Galfin Sociedad de Bolsa, Europa Sociedad de Bolsa, Darío Cukier, GBU, Hordeñana & Asociados Sociedad de Bolsa, etc. Tourism Tourism accounts for much of Uruguay's economy. Tourism in Montevideo is centered in the Ciudad Vieja area, which includes the city's oldest buildings, several museums, art galleries, and nightclubs, with Sarandí Street and the Mercado del Puerto being the most frequented venues of the old city.