As you might expect Mr. Chair, because of our capital acquisitions and the sources of those acquisitions, many of them are foreign. Moreover, because of foreign military arrangements, when we collaborate with allies we have a significant number of transactions every year denominated in U.S. dollars. In 2010-11, those transactions amounted to approximately $2 billion. The amount fluctuates—sometimes it's higher, sometimes it's lower. So in 2011 it was about $2 billion.
Between June and August of this year, you may recall, the Canadian dollar appreciated about 13% against the U.S. dollar. To the extent that we had closed sales and taken delivery of assets, hypothetically, in that period, we would have had a currency gain. Just using $2 billion as an example, we would have had a currency gain of about $260 million. That would have shown up in the public accounts as a lapse, when actually it should be a good news story. We would be held to account for the fact that we had lapsed that $260 million, yet it should be a good news story.
I'll give you a real-life example. We bought strategic lift aircraft, the C-17s, I believe in 2007-08. Between the time we actually made the decision to buy those aircraft and took delivery, the Canadian dollar appreciated. At the end of the day, those aircraft cost us $200 million less than we had anticipated simply as a result of foreign exchange.
Again, we have to manage that surplus and are held to account for those fluctuations when it comes time to talk about public accounts. Those are hundreds of millions of dollars in fluctuations that are unpredictable, utterly beyond our control, and show up in the public accounts.