CONCORD, N.H. (AP) — Gas prices have dropped slightly in northern New England during the last week. The latest GasBuddy.com survey released Monday shows New Hampshire gas prices went down 2 cents in the past week, averaging $2.09 a gallon. Maine’s prices fell a penny, averaging $2.20 a gallon. In Vermont, prices went down less than a penny, to $2.15 a gallon. The national average price of gasoline has fallen 3.2 cents per gallon in the last week, averaging $2.17. The national average is down 0.5 cents per gallon from a month ago and stands 38.6 cents per gallon lower than a year ago.