The service sector accounts for 51 percent of the nation's total GDP. The most vital component of the service sector is trade and transport. In terms of trade the nation has profited greatly from its 2 major rivers, the Paraguay and the Parana, particularly in the last half of the 20th century. Other service industries do not yet play a significant role in the national economy. The finance industry is small and state-dominated, and the nation has not yet established a profitable tourism industry. With the exception of a small but developing tourism industry in Asunción, tourism-related business is virtually nonexistent and plays an insignificant role in the economy elsewhere.