that 2mil is WW sales.. 1.1mil is the correct US sales... and without the 99cents it is 700k... and to be fair you should include Taylor Swift and Adele's albums in this comparison...Taylor sold 1.2mil of her Album RED in its first week...
All of the numbers here are stats from American sales EXCEPT for Gaga's which was World sales. Which means the other artists probably had even higher sales across the world too. Sorry, but this is VERY MISLEADING AND BIASED.