were built, accounting for . The average size for these new tankers was . Nineteen of these were VLCC size, 19 were Suezmax, 51 were Aframax, and the rest were smaller designs. By comparison, , , and worth of oil tanker capacity was built in 1980, 1990, and 2000 respectively. Ships are generally removed from the fleet through a process known as scrapping. Ship-owners and buyers negotiate scrap prices based on factors such as the ship's empty weight (called light ton displacement or LDT) and prices in the scrap metal market. In 1998, almost 700 ships went through the scrapping process at shipbreakers in places such as Gadani, Alang and Chittagong. In 2004 and 2005, and respectively of oil tankers were scrapped. Between 2000 and 2005, the capacity of oil tankers scrapped each year has ranged between and . In this same timeframe, tankers have accounted for between 56.5% and 90.5% of the world's total scrapped ship tonnage. In this period the average age of scrapped oil tankers has ranged from 26.9 to 31.5 years. Vessel pricing In 2005, the price for new oil tankers in the , , and ranges were $43 million, $58 million, and $120 million respectively. In 1985 these vessels would have cost $18 million, $22 million, and $47 million respectively. Oil tankers are often sold second hand. In 2005, worth of oil tankers were sold used. Some representative prices for that year include $42.5 million for a tanker, $60.7 million for a , $73 million for a , and $116 million for tanker. For a concrete example, in 2006, Bonheur subsidiary First Olsen paid $76.5 million for Knock Sheen, a 159,899 DWT tanker. The cost of operating the largest tankers, the Very Large Crude Carriers, is currently between $10,000 and $12,000 per day. Current structural design Oil tankers generally have from 8 to 12 tanks. Each tank is split into two or three independent compartments by fore-and-aft bulkheads. The tanks are numbered with tank one being the forwardmost. Individual compartments are referred to by the tank number and the athwartships position, such as "one port", "three starboard", or "six center". A cofferdam is a small space left open between two bulkheads, to give protection from heat, fire, or collision. Tankers generally have cofferdams forward and aft of the cargo tanks, and sometimes between individual tanks. A pumproom houses all the pumps connected to a tanker's