Just found this in the iTunes thread :
106 +147 Demi Lovato - Skyscraper 64 1(3) 1.019
128 +173 Demi Lovato - Give Your Heart a Break -- 128 0.037
so the rough prediction was that GYHAB sold 37k until last Wednesday. But you see, they say 1 million for Skyscraper so it doesn't have to be true.
BUT after this week she could sell 10k, so GYHAB would be at 47k, almost 50k. My prediction is 55k tho, but we'll see
