(Portland, OR) -- The decline in gas prices is slowing down. Triple-A reports higher crude oil prices are the cause. Nationally, the average price for a gallon of gas was unchanged last week at two-dollars-82-cents. Oregon's average declined two cents to three-33. While the national and Oregon averages are near five year lows, they're expected to start going up during refinery maintenance and the switch to summer blends of fuel. Oregon's average is 19 cents lower than this time last year.