Wait... that's a horrible graphic! Talk about distortions... 4,000 is more than half of 7,200, but the pie wedge makes it look much less. And of those 4,000 successfully traced, almost all of them did come from the US.
Here, try it like this: of the 7,200 guns that the ATF were given to trace, 48% came from the US.
See, this is exactly the sort of thing that the antis accuse us of, distorting the facts. And, in this case, they are right. Someone went out of their way to make the pie wedges look less significant than they are. Not a good way to win supporters.