After the Gulf War, Bahrain received additional military support from the United States, including the sale of 54 M60A3 tanks, 12 F-16C/D aircraft, and 14 Cobra helicopters. Joint naval, air and ground exercises also have been planned and executed to increase readiness throughout the Persian Gulf. Bahrain and the United States signed a Defense Cooperation Agreement in October 1991, granting U.S. forces access to Bahraini facilities and ensuring the right to pre-position material for future crises. In 2003, George W. Bush designated Bahrain as a major non-NATO ally of the United States. Since 2003, Bahrain has been granted over $100 million in Foreign Military Funding to pay for various high-profile weapons systems, to include an AN/TPS-593B Early Warning Radar, Large Aircraft Infrared Countermeasures , Air-to-Air Missile Avoidance System for the King's Plane , as well as an Avenger Air Defense Vehicle.
Question: How many years passed after the Defense Cooperation Agreement in 1991 before Bahrain was designated as a major ally of the US?
Answer: 12