BOSTON (AP) — Massachusetts gas prices continued their downward spiral, dropping another 9 cents per gallon in the past week to an average of $3.17.

AAA Southern New England said Monday the cost of a gallon of self-serve, regular in the Bay State has now dropped 22 cents in the past month, prices are 21 cents lower than at the same time a year ago, and are at their lowest level since February 2011.

Yes despite the steep drop, Massachusetts prices are 7 cents above the national per-gallon average.

AAA found self-serve regular selling for as low as $2.89 per gallon and as high as $3.43.