With the U.S. military claiming that Iranian-made "explosively formed penetrators" (EFPs) have killed 170 coalition forces and wounded 620 in Iraq, this chart puts those casualty numbers into context.

Cause of Coalition Casualties	Deaths	Wounded	Percent of all deaths	Percent of hostile deaths	Percent of all wounded
EFP (from Iran?)	170	620	5.03%	6.24%	3.77%
IED (includes EFP)	1190	not disclosed	35.2%	43.65%	-
All hostile action	2,726	not disclosed	80.7%	-	-
Hostile/non-hostile combined	3,379	23,417	-	-	-
Raw stats from icasualties.org		total wounded US only

Here is Wikipedia's explanation of the EFP.