Part of this difference is also the fluctuation in exchange rates. Around 2014, 1 CAD was worth about 1 USD, but since then, the loonie has plummeted in value

Part of this difference is also the fluctuation in exchange rates. Around 2014, 1 CAD was worth about 1 USD, but since then, the loonie has plummeted in value relative to the greenback. That doesn't account for the entire difference, but it does account for some of it.