8 to 12 million is the "official" govt figure, which is thought to be white-washing of the true figures.
I've seen upwards of 20 million which was given by Bear Stearns, I believe.
No one really has an accurate figure, it could be higher.
8-12 million is a large number anyway and 20 million is still within a very high range but sometimes, like 30 million, seems like it's going beyond the range that actually turns off the positive impression of what's trying to be accomplished.