PORTLAND — The average retail price of gasoline has risen 2.1 cents per gallon in the past week.

GasBuddy’s daily survey of 1,228 gas outlets in Maine says prices are averaging $2.22 per gallon. The national average has increased 2.7 cents per gallon in the past week to the same price.

Maine gas was about 79 cents more expensive per gallon at this time last year, and it was also 2.4 cents per gallon higher a month ago. The national average dipped 10.4 cents per gallon during the last month and is about 71 cents less than a year ago.