As of 2006[update], the United States Bureau of Transportation Statistics count 2,837 container ships of 10,000 long tons deadweight (DWT) or greater worldwide.[52] Panama was the world's largest flag state for container ships, with 541 of the vessels in its registry.[52] Seven other flag states had more than 100 registered container ships: Liberia (415), Germany (248), Singapore (177), Cyprus (139), the Marshall Islands (118) and the United Kingdom (104).[52] The Panamanian, Liberian, and Marshallese flags are open registries and considered by the International Transport Workers' Federation to be flags of convenience.[53] By way of comparison, traditional maritime nations such as the United States and Japan only had 75 and 11 registered container ships, respectively.[52]