Oil prices were unchanged over the last week with WTI futures at $52.28 per barrel and Brent at $55.36 barrel. A year ago, WTI was at $54, and Brent was at $59 - so WTI oil prices are down about 5% year-over-year.
Here is a graph from Gasbuddy.com for nationwide gasoline prices. Nationally prices are at $2.39 per gallon. A year ago prices were at $2.54 per gallon, so gasoline prices are down $0.15 per gallon year-over-year.