HOUSTON — The number of rigs exploring for oil and natural gas in the U.S. declined by four this week to 909. Louisiana's count dropped three rigs to 62, but is up 46 from a year ago.

The U.S. tally is up 352 from the 557 rigs that were active a year ago. The count bottomed out in May 2016 at 404.

Houston oilfield services company Baker Hughes said Friday that 737 rigs sought oil and 172 explored for natural gas this week.

Among major oil- and gas-producing states, Texas gained five rigs and Oklahoma and Wyoming each increased by one.

North Dakota and West Virginia each declined by two; Alaska, Colorado, Kansas, New Mexico and Pennsylvania each lost one.

Arkansas, California, Ohio and Utah were unchanged.