The report notes that spot prices for the international crude oil benchmark Brent averaged $52/bbl in 2015, 53% below the level in 2014 and 49% below the average price over 2010-14.
Spot prices for West Texas Intermediate (WTI) crude oil were also down 53% in 2015 compared with 2014, averaging $49/bbl for the year.
Lower crude oil prices in 2015 reflected the sustained excess of crude oil supply over global demand. As a result, global crude oil and other liquids inventories increased steadily through the year. Global inventories increased in each quarter of 2015, with a net inventory build of 1.72 MMb/d, the highest rate since at least 1996, the EIA report said.