https://www.houston.org/houston-data/monthly-update-energy

The closing spot price for a barrel of West Texas Intermediate (WTI), the U.S. benchmark for light, sweet crude, averaged $51.38 per barrel in January ’19, down 19.3 percent from $63.70 in January ’18, according to the U.S. Energy Information Administration. Natural gas prices averaged $3.11 per million British thermal units (MMBtu) in January ’19, down 19.6 percent from $3.87 in January last year.