What's particularly striking is if you compare the months of May-June-July for all three years -- a time when there were no major battles:
August is shaping up to fit well within this trend.
U.S. Deaths May 2003-2004-2005: 31, 80, 88
U.S. Deaths June 2003-2004-2005: 34, 52, 89
U.S. Deaths July 2003-2004-2005: 42, 60, 65
As things get worse and worse, the pro-war establishment is naturally enough preparing to declare victory and go home.