In 2012, prices reached the highest level in the eighty-year series in both current and constant dollars, but began a steep decline thereafter. In constant dollar terms, the price of gasoline in 2015 was only seven cents higher than in 1929. Average Historical Annual Gasoline Pump Price, 1929-2015 What is the history of gas prices in Canada? - Quora Jul 14, 2014 · Here are the historical gas prices in Canada (expressed in USD and gallons) for the past ten years. I arbitrarily charted it against US gas prices, for comparison. You can play around with the time intervals here, if these measurement periods ar