"And while the United States is still the world’s No. 1 exporter, that is nothing compared with its dominance of the other end of the trade equation. In the first half of this year, it imported more than China and Germany put together, and three times as much as Japan."
No indication of the source of the data, though the preceding paragraph cites Robert Barbera in suggesting that the growth rate of US imports has been slowing since the 90s, with a greater share of world exports being directed towards Europe.
http://www.nytimes.com/2006/08/12/business/12charts.html