Answer:
As of 2007, the United States Central Intelligence Agency statistics count 4,295 oil tankers of 1,000 long tons deadweight (DWT) or greater worldwide.[68] Panama was the world's largest flag state for oil tankers, with 528 of the vessels in its registry.[68] Six other flag states had more than 200 registered oil tankers: Liberia (464), Singapore (355), China (252), Russia (250), the Marshall Islands (234) and the Bahamas (209).[68] By way of comparison, the United States and the United Kingdom only had 59 and 27 registered oil tankers, respectively.[68]__Wikipedia