Read this: In terms of total number of ships, the Greek Merchant Navy stands at 4th worldwide, with 3,150 ships (741 of which are registered in Greece whereas the rest 2,409 in other ports). In terms of ship categories, Greece ranks first in both tankers and dry bulk carriers, fourth in the number of containers, and fifth in other ships. However, today's fleet roster is smaller than an all-time high of 5,000 ships in the late 1970s. Additionally, the total number of ships flying a Greek flag (includes non-Greek fleets) is 1,517, or 5.3% of the world's dwt (ranked 5th).

Where is the Greek Merchant Navy ranked?
What is the answer? (If it cannot be answered, return "unanswerable")
4th worldwide