Colombia is the United States' fifth-largest export market in Latin America—behind Mexico, Brazil, Venezuela, and Argentina—and the 26th-largest market for U.S. products worldwide. The United States is Colombia's principal trading partner, with two-way trade from November 1999 through November 2000 exceeding $9.5 billion--$3.5 billion U.S. exports and $6.0 billion U.S. imports. Colombia benefits from duty-free entry—for a 10-year period, through 2001—for certain of its exports to the United States under the Andean Trade Preferences Act. Colombia improved protection of intellectual property rights through the adoption of three Andean Pact decisions in 1993 and 1994, but the U.S. remains concerned over deficiencies in licensing, patent regulations, and copyright protection.