I would have to go back and do a lot of analysis to determine that, but what we know is that in 2013 and 2014, the transportation of crude oil by rail was increasing significantly. During those years we had the Lac-Mégantic accident, in 2013.
Since then, and especially since 2015, there have been a number of actions taken by the industry and by the regulator to reduce the risk of a derailment or the consequences of a derailment. We also saw a drop in activity during a couple of years. I don't think you can make a direct cause and effect, especially since Lac-Mégantic happened in the summer, but there's no doubt that winter operations are much harder in terms of rail activities than are those in summer, because of the extreme cold conditions.