HOUSTON — The number of rigs exploring for oil and natural gas in the U.S. increased by eight this week to 915. Louisiana gained four to 62 for the week and is up 10 from a year ago.

The U.S. tally is up from the 588 rigs that were active a year ago. The U.S. rig count bottomed out in May 2016 at 404.

Houston oilfield services company Baker Hughes said Friday that 738 rigs sought oil and 177 explored for natural gas this week.

Among other major oil- and gas-producing states, Texas gained seven rigs and Ohio and Utah, one apiece. Alaska, Colorado, New Mexico, North Dakota, Oklahoma and Wyoming declined by one each.

Arkansas, California, Pennsylvania and West Virginia were unchanged.