West Texas Intermedeiate (WTI) recorded another drop, prolonging its second monthly loss with increased crude stockpiles in the U.S. indicating slower demand in the world’s biggest oil consumer.

Futures took a hit of 0.8 percent in New York when the industry-funded American Petroleum Institute announced that inventories increased by 5.9 million barrels last weeks. Supplies reached 382.2 million barrels, recording a jump of 2.4 million barrels, the highest in four months before data from the Energy Administration today.

December deliver of WTI fell as much as 80 cents to &97.40 a barrel on the New York Mercantile Exchange, which the volume of all futures traded declined 17 percent more than the 100-day average. October has seen a drop of 4.5 percent following a 4.9 percent drop last month.