It is based on their compliance profile. We do that on the basis of risk. Those companies that, based on what we know about their operations, have a very high compliance level would be inspected less frequently than those that do not have a similar level of compliance. So, it varies. Since CN and CP are responsible for about 72% of all the rail traffic in Canada, a good chunk of our time is spent with those two companies.
On February 8th, 2011. See this statement in context.