We respond to each and every occurrence that happens. I can tell you, in the last couple of years they've reached numbers that approximate those of the height of the Cold War. On each and every occasion there's been Canadian or U.S. air power, depending on their approaches, ready in response.
That quite often happens north of Inuvik. We'll deploy F-18s to Inuvik and be ready to intercept them if they approach Canadian airspace. That's not an uncommon occurrence. I don't have specific numbers available to me right now, but I'm sure the commander of NORAD or the deputy commander of NORAD, when he's here next week, will be able to give you more specificity.