The national average gasoline price increased to $2.37 per gallon for the week ending Jan. 9 in an upward move driven by the OPEC announcement of a production cut in late 2016, according to AAA.

National average gasoline prices moved 3 cents higher during the week and 17 cents during the month. Retail prices have increased for 40 of the 42 days since the announcement. The average price of regular unleaded has increased 39.2 cents in the past year to $2.388, according to data from the U.S. Energy Information Administration.

The nation’s 10 least expensive markets now include South Carolina ($2.14), Tennessee ($2.14), Mississippi ($2.15), Alabama ($2.16), Arizona ($2.16), Arkansas ($2.16), Texas ($2.17), Oklahoma ($2.17), Louisiana ($2.18) and Missouri ($2.18).

The biggest weekly increases were seen in Michigan (9 cents), Pennsylvania (8 cents), Delaware (8 cents), Oregon (7 cents), West Virginia (6 cents), Washington (6 cents), Alaska (6 cents), Ohio (5 cents), Virginia (5 cents) and Maryland (5 cents).

Meanwhile, the average price of diesel increased 1.1 cents to $2.597. Diesel is now 42 cents higher than a year ago.