Brunei's oil production peaked in 1979 at over . Since then it has been deliberately cut back to extend the life of oil reserves and improve recovery rates. Petroleum production is currently averaging some . Japan has traditionally been the main customer for Brunei's oil exports, but its share dropped from 45% of the total in 1982 to 19% in 1998. In contrast, oil exports to South Korea increased from only 8% of the total in 1982 to 29% in 1998. Other major customers include Taiwan (6%), and the countries of ASEAN (27%). Brunei's oil exports to the United States accounted for 17% of the total exported.