The country's economy has traditionally depended on agriculture. Although sugarcane is the chief crop and sugar is an important export, sugar production has sharply declined in recent years. Other major crops are coffee, cotton, cocoa, tobacco, and rice. There are deposits of nickel, bauxite, gold, silver, and other minerals, and mining is of growing economic importance. Free-trade zones have led to an increase in light industry, especially the manufacture of textiles and clothing. Tourism is also important to the economy, and the service sector is now the country's largest employer. The United States, Mexico, and Colombia are the main trading partners.