In 1978, ESAI began building a database of commercial and government-held oil inventories for every country that held inventories and tracked them in their national statistics. In subsequent years, ESAI also began collecting data on supply and demand. Today, global petroleum data are more plentiful, but also more complicated and potentially unreliable; ESAI’s 25-year experience with collecting and interpreting data from both emerging and established countries has led to the development of a unique and evidence-based source of market intelligence. With this data base, the Petroleum and Alternatives team analyzes the supply/demand factors which shape oil prices.