Oilfield services company Baker Hughes Inc. says the number of rigs exploring for oil and natural gas in the U.S. declined by 27 this week to 514.

The Houston company said Friday 413 rigs sought oil and 101 explored for natural gas amid depressed energy prices. A year ago, 1,310 rigs were active.

Among major oil- and gas-producing states, Texas declined by 12 rigs, Oklahoma and North Dakota, three each; Louisiana, two; and Colorado, Kansas, New Mexico and Wyoming, one apiece.

Alaska, Arkansas, California, Ohio, Pennsylvania, Utah and West Virginia were all unchanged.