sea to by decree. Thus, by mid-1972, the Strait of Hormuz was completely "closed" by the combined territorial waters of Iran and Oman. During the 1970s, neither Iran or Oman attempted to impede the passage of warships through the strait, but in the 1980s, both countries asserted claims that were different from customary (old) law. Upon ratifying UNCLOS in August 1989, Oman submitted declarations confirming its 1981 royal decree that only innocent passage is permitted through its territorial sea. The declarations further asserted that prior permission was required before foreign warships could pass through Omani territorial waters. Upon signing the convention in December 1982, Iran entered a declaration stating "that only states parties to the Law of the Sea Convention shall be entitled to benefit from the contractual rights created therein", including "the right of transit passage through straits used for international navigation". In May 1993, Iran enacted a comprehensive law on maritime areas, several provisions of which conflict with UNCLOS provisions, including a requirement that warships, submarines, and nuclear-powered ships obtain permission before exercising innocent passage through Iran's territorial waters. The United States does not recognize any of the claims by Oman and Iran and has contested each of them. Oman has a radar site Link Quality Indicator (LQI) to monitor the TSS in the Strait of Hormuz. This site is on a small island on the peak of Musandam Governorate. Oil trade flow A 2007 report from the Center for Strategic and International Studies also stated that 17 million barrels passed out of the Persian Gulf daily, but that oil flows through the Strait accounted for roughly 40% of all world-traded oil. According to the U.S. Energy Information Administration, in 2011, an average of 14 tankers per day passed out of the Persian Gulf through the Strait carrying of crude oil. This was said to represent 35% of the world's seaborne oil shipments and 20% of oil traded worldwide. The report stated that more than 85% of these crude oil exports went to Asian markets, with Japan, India, South Korea and China the largest destinations. In 2018 alone, 21 million barrels a day were passing through the strait - this means $1.17 billion worth of oil a day, at September 2019 prices. Events Tanker War The Tanker War phase of the Iran–Iraq War started when Iraq attacked the oil terminal and oil tankers at Iran's Kharg Island in