I got my data from the financial supplements on this page. There’s a small discrepancy in the Q1 2006 numbers, depending on whether you look at the Q1 2006 release or the Q1 2007 release. But it’s only about $100 million, so I didn’t bother looking into it [emphasis mine].
Now, his use of the words "only" and "small" is (I think) intentionally ironic. The funny part is that it's also appropriate. (Look at the scale of the vertical axes in his graphs.)
I tend to ideologically disagree with Kwak and his co-blogger Simon Johnson on a number of points, but their blog is still highly recommended. I (belatedly) thank my mother-in-law for having directed me to it.