Over the last 12 months you can see a steadily increasing trend. I don't think it's been below $5 since last November. It's supply and demand across North America, but certainly you can't downplay the short-term impact of the recent hurricanes in the Gulf Coast.

The average increase this year is going to be around 50 per cent. If someone had a budget amount the previous year of $100, they'll be looking in the order of $150 this coming year.