US crude oil futures added to their losses in the middle of the trading week after the latest supply data confirmed a significant build in domestic inventories.

January West Texas Intermediate (WTI) crude oil futures tumbled $1.84, or 2.07%, to $87.07 per barrel at 15:48 GMT on Wednesday on the New York Mercantile Exchange. US crude prices have slumped more than 2% this week, but they remain up more than 15% year-to-date.

Brent, the international benchmark for oil prices, sipped below $94 midweek. February Brent crude futures fell $1.79, or 1.88%, to $93.57 a barrel on London’s ICE Futures exchange. Brent has also struggled to hold onto its recent gains.

According to the US Energy Information Administration (EIA), domestic stockpiles of crude oil increased by 3.925 million barrels for the week ending November 4, topping the market estimate of 1.364 million barrels. This is also up from the 3.115-million-barrel decline in the previous week.

Supplies at the Cushing, Oklahoma storage facility dropped 923,000 barrels. Gasoline stocks declined 899,000 barrels, while distillate inventories fell 521,000 barrels. Heating oil stockpiles also shed 217,000 barrels.

Meanwhile, the EIA raised its 2022 and 2023 forecasts for heating oil and diesel prices in its Short-Term Energy Outlook (STEO). It anticipates residential heating oil prices will average $4.79 per gallon this year and $4.63 a gallon next year. Retail diesel prices are projected to average $5.09 in 2022 and $4.65 next year.

The reason has to do with distillate inventories being at their lowest levels in more than 70 years.

“Inventories are just one part of the supply equation for diesel and other distillates,” said EIA Administrator Joe DeCarolis in a statement. “The distillate fuels in storage aren’t the only source of diesel we have to keep trucks and trains moving, but lower-than-average storage levels will contribute to higher costs for diesel and for heating fuels through the winter.”

On Wednesday, the national average for a gallon of diesel rose to $5.35, according to the American Automobile Association (AAA).

In other energy commodities, January natural gas futures slid $0.239, or 3.66%, to $6.285 per million British thermal units (Btu). January gasoline futures shed $0.0496, or 1.88%, to $2.5871 a gallon. January heating oil futures erased $0.0887, or 2.35%, to $3.682 per gallon.