I think that if you take a look over the course of the pandemic, over the course of the past two years there has been a range of factors that have led to changes in prices in a range of different commodities.
As Mr. Arora mentioned earlier, in May of 2020, crude oil prices went negative for a period. If we follow the supply chain through, this of course had an impact on our raw material prices index and our industrial product price index, through to the price we're seeing at the pump. As Saudi Arabia and Russia cut back on oil production, demand for oil shot up. Prices go up, and ultimately that leads to an increase in prices at the pump.
Through a range of different commodities, we've been seeing a larger number of sharp price movements. Lumber has had an impact on the price of residential construction. It's had an impact on sales in hardware stores, with factors driven not only by demand for lumber in Canada but also a demand for lumber in the United States. It's almost like every commodity has a story.