The increase in numbers doesn't surprise me, as the UK more or less shut their doors to IMGs recently with the implementation of a visa requirement. I'm guessing that many English speaking docs from the Commonwealth, in particular India and Pakistan are applying to the US instead.
What worries me though, is that many of these applicants may not have a real love for psychiatry even with their double 99s.
That said, I'm glad that I have a handful of interviews, though I'm hoping for a couple more.