Prius is outselling its tax credit

I've been looking for info on how many Prius have actually been sold so far this year. Hopefully at the end of January we can find a report somewhere? Anybody know where to get this sort of info? I purchase mine already this year, so the tax credit phaseout isn't an issue for me personally, but I'm just curious what effect the tax credit had and to compare Dec. sales with Jan. sales. Also it will be interesting to see when the 60,000 mark for Toyota is met.