US Gulf (Mississippi) Argentina (Up River) 3/7/07 19/6/07 5/6/07 22/5/07 8/5/07 24/4/07 10/4/07 27/3/07 13/3/07 27/2/07 13/2/07 30/1/07 16/1/07 2/1/07 19/12/06 5/12/06 21/11/06 7/11/06 24/10/06 10/10/06 26/9/06 12/9/06 29/8/06 15/8/06 1/8/06 18/7/06 4/7/06 150,000 125,000 100,000 75,000 50,000 25,000