My De sales have steadily gone down over the summer. Same with Fr, Nl, and Es. Ca and Au have remained steady. I never have gotten much from Jp, Mx, or Br for my non-translated books, so it is hard to tell if they've gone down or not (not enough sales to see a trend).
What this means, I don't know. Ca, Au, and UK, provide a significant percentage of my income, but the others combined have been only a small boost even at their best, so a smaller boost doesn't really have a big impact on my bottom line.
I agree that other-store sales have been poor. Oddly, Amazon.com has been stronger in September than in any month in a year or so -- but it's only the 15th, and in my experience my sales tail off toward the end of the month, as if all my readers were pensioners and waiting for the check to come again.
If you're after international sales, you should try Goo*gle Play.
A quick scan of my December report shows sales in PH, ZA, CZ, RU, TR, MY, TH, and more, among the usual GB, CA. AU, NZ, etc. They're not enough for me to retire early, but they're 100X the amount I would have got from the crumbs thrown at us by Kay Yu.
I used to have a publisher who had success with my books (romcom usually) but have had zero luck myself self publishing with google play.
I actually changed the font to 20 pt thinking this would help smartphone readers, but this didn't help.
I've almost given up with this outlet.