Vietnam has considerable oil reserves and was the sixth-largest oil producer in the Asia-Pacific region in 2011. However, production has declined in recent years and the country is now a net oil importer. Petroleum accounted for 14 percent of government income in 2009, down from 24 percent in 2004, the result of a significant drop in revenue. Vietnam also has an estimated 24.7 trillion cubic feet of natural gas reserves, and the government is actively promoting investment in the sector.