November 5, 2010 - In the Economy category of The World Factbook, "Oil - exports," "Oil - imports," "Oil - proved reserves," and "Natural gas - proved reserves" fields have been updated with the most recent estimates available.
World Factbook Updates - November 5, 2010 (https://www.cia.gov/library/publications/rss-updates/world-factbook-updates-november-5-2010.html)