Oil prices were down over the last week with WTI futures at $22.61 per barrel and Brent at $31.30 barrel. A year ago, WTI was at $64, and Brent was at $72, so oil prices are down about 60% year-over-year.
Here is a graph from Gasbuddy.com for nationwide gasoline prices. Nationally, prices are at $1.83 per gallon. A year ago, prices were at $2.83 per gallon, so gasoline prices are down $1.00 per gallon year-over-year.