It's a very tricky question because numbers are always tricky.
From the last population-based survey we did in 2013, the lifetime prevalence, I think I read, was 11.1%. That's a lifetime prevalence. It doesn't talk about cause. It doesn't say that it's because of Afghanistan. It could be from childhood, as one of our previous witnesses said. I believe—and I can be corrected later on—that the 12-month prevalence was just about 5%, which is about double what it was in the 2002 survey.
Remember that depression has been and always will be in the armed forces, even in times of war—just like in civilian society—the number one mental health condition, the most prevalent and the largest burden. PTSD varies from time to time, but trauma.... Our military members in most of our countries—Canada and the U.S.—have a higher propensity for adverse childhood events when they're growing up. It's the type of people we attract as well, so the PTSD lifetime doesn't necessarily relate to military operations, although military operations certainly are a big part of it.